Fan assembly and blowing device

Abstract

The invention discloses a fan assembly and a blowing device. The fan assembly comprises a fan shell; the assembly seat is arranged in the fan shell, and the assembly seat is connected with the fan shell through a plurality of static blades; the motor assembly is assembled in the fan shell; the fan blades are connected with the motor assembly; an air inlet opening communicated with the interior of the fan shell and the interior of the motor assembly is formed in the motor assembly, an internal assembling gap allowing airflow to flow is formed in the motor assembly, a first air outlet hole is formed in the assembling base, and the air inlet opening, the internal assembling gap and the first air outlet hole form a first heat dissipation channel. Air flow enters the motor assembly along the air inlet opening of the motor assembly under the action of air pressure and flows out of the motor assembly through the internal assembling gap and the first air outlet hole.

Description

Technical Field

[0001] The present application relates to the field of fans, and in particular to a fan assembly and a blowing device. Background Art

[0002] In the hot summer, fans have become a must-have item for people to get rid of the heat. With people's demand for convenient use, lighter and more portable fans are becoming more and more popular.

[0003] In the prior art, a fan is provided with a fan motor and fan blades, wherein the fan motor is fixed in a fan housing, and the fan motor is connected to the fan blades via a rotating shaft. In order to increase the air output efficiency and air volume of the fan, the fan motor speed is usually increased.

[0004] The inventors of this invention discovered during research that when the fan motor rotates at high speed, the fan motor will generate more heat. After the heat accumulates, if the fan motor cannot be cooled in time, it will cause the fan motor to overheat, affecting the stability of the fan motor's operation, and in severe cases even causing the fan motor to be damaged or catch fire. Summary of the invention

[0005] The purpose of the present application is to provide a fan assembly and a blowing device that can dissipate heat from a fan motor in a timely and effective manner.

[0006] The present application provides a fan assembly, including:

[0007] Fan housing;

[0008] An assembly seat, the assembly seat is arranged in the fan housing, and the assembly seat is connected to the fan housing through a plurality of stationary blades;

[0009] a motor assembly, the motor assembly being assembled in the fan housing;

[0010] A fan blade connected to the motor assembly;

[0011] The motor assembly is provided with an air inlet opening connecting the interior of the fan housing and the interior of the motor assembly. The interior of the motor assembly is provided with an internal assembly gap for air flow. The assembly seat is provided with a first air outlet hole. The air inlet opening, the internal assembly gap and the first air outlet hole constitute a first heat dissipation passage.

[0012] To achieve the purpose of the present application, an embodiment of the present application further provides a blowing device, which is assembled with a fan assembly as described above.

[0013] The beneficial effect of the embodiment of the present application is that the fan blades rotate under the drive of the motor assembly, and the rotation of the fan blades further promotes the airflow in the fan housing to move in a directional manner. The airflow belongs to a fluid, and the unique flow characteristics of the fluid will cause the airflow to flow to any airflow channel connected to the external environment. Under the action of wind pressure, the airflow enters the interior of the motor assembly along the air inlet opening of the motor assembly, and flows out from the interior of the motor assembly through the internal assembly gap and the first air outlet. The above-mentioned flow of the airflow will take away the heat generated by the operation of the motor assembly, cool down the motor assembly, and play a role in air cooling. Since the first heat dissipation path cools down the interior of the motor assembly, under the condition of the same air volume, since the temperature inside the motor assembly is higher, more heat is taken away by air cooling, and the heat dissipation effect is more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0015] Figure 1 This is a schematic diagram of the overall structure of a fan assembly according to a specific embodiment of the present application;

[0016] Figure 2 A cross-sectional schematic diagram of a fan assembly according to a specific embodiment of the present application;

[0017] Figure 3 This is an exploded schematic diagram of a fan assembly according to a specific embodiment of the present application;

[0018] Figure 4 This is a schematic structural diagram of a fan housing according to a specific embodiment of the present application;

[0019] Figure 5 A schematic diagram of the airflow path of a first heat dissipation path according to a specific embodiment of the present application;

[0020] Figure 6 A schematic diagram of the airflow path of the second heat dissipation path of a specific embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the support structure of a specific embodiment of the present application;

[0022] Figure 8 This is a cross-sectional schematic diagram of a support member according to a specific embodiment of the present application;

[0023] Fig. 9 This is a schematic diagram of the structure of a motor housing according to a specific embodiment of the present application;

[0024] Fig.10 A schematic diagram of a coil structure and gap indication of a specific embodiment of the present application;

[0025] Fig.11 A cross-sectional view and gap indication schematic diagram of a fan assembly according to a specific embodiment of the present application;

[0026] Fig.12 This is a schematic diagram of a hollow tube structure according to a specific embodiment of the present application.

[0027] Description of the drawings: 1. Fan housing; 11. Stationary blades; 111. Guide teeth; 2. Assembly seat; 21. Connecting tube; 22. Connecting ring; 23. Hollow tube; 231. First hollow end; 232. Second hollow end; 24. First air outlet; 3. Motor assembly; 31. Motor rotor; 311. Motor housing; 312. Magnetic ring; 313. Rotating shaft; 314. Air inlet opening; 32. Motor stator; 321. Coil; 32 2. Iron core; 33. First bearing; 34. First elastic member; 35. Support member; 351. First support end; 352. Second support end; 353. First deformation notch; 354. Second deformation notch; 355. Protruding ridge; 36. Second bearing; 4. Fan blade; 41. Wheel hub; 411. Reinforcing rib; 42. Moving blade; 421. Trailing edge serration; 43. Connecting shaft column; 5. PCB circuit board; 51. Second air outlet. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0030] Example 1

[0031] See also Figure 1 , Figure 2 and Figure 5 , Figure 1 is a schematic diagram of the overall structure of the fan assembly of this embodiment; Figure 2 is a cross-sectional schematic diagram of the fan assembly of this embodiment; Figure 5 FIG. 4 is a schematic diagram of the airflow path of the first heat dissipation path of this embodiment.

[0032] like Figure 1 , Figure 2 and Figure 5 As shown, a fan assembly comprises: a fan housing 1; an assembly seat 2, which is arranged in the fan housing 1 and connected to the fan housing 1 through a plurality of stationary blades 11; a motor assembly 3, which is assembled in the fan housing 1; fan blades 4, which are connected to the motor assembly 3; an air inlet opening 314 connecting the interior of the fan housing 1 and the interior of the motor assembly 3 is provided on the motor assembly 3, an internal assembly gap (not shown) for air flow is provided inside the motor assembly 3, a first air outlet hole 24 is provided on the assembly seat 2, and the air inlet opening 314, the internal assembly gap and the first air outlet hole 24 constitute a first heat dissipation path.

[0033] In this embodiment, the fan housing 1 is configured as a cylinder, and a cylindrical air cavity is provided inside the cylinder. However, the shape of the fan housing 1 is not limited thereto. Depending on the specific application scenario, in some embodiments, the shape of the fan housing 1 can be: a triangle, a quadrilateral, a pentagon, other polygons or other regular shapes. The outer shape structure of the fan housing 1 can be determined according to the needs of the specific application scenario and is not limited to the specific embodiment.

[0034] One end of the assembly seat 2 is arranged in the fan housing 1, and the other end of the assembly seat 2 extends out of the fan housing 1. However, the positional relationship between the assembly seat 2 and the fan housing 1 is not limited thereto. According to different specific application scenarios, in some embodiments, the assembly seat 2 is entirely arranged in the fan housing 1. The positional relationship between the assembly seat 2 and the fan housing 1 can be determined according to the needs of the specific application scenario, and is not limited to the specific embodiment.

[0035] In this embodiment, the number of the stationary blades 11 is 7. However, the number of the stationary blades 11 is not limited thereto. Depending on the specific application scenario, the number of the stationary blades 11 can be 2, 3, 4, 5, 6, 8 or more. The number of the stationary blades 11 can be determined according to the needs of the specific application scenario and is not limited to the specific embodiment.

[0036] In this embodiment, the motor component 3 can be (but not limited to): a single-phase motor, a two-phase motor or a three-phase motor.

[0037] In terms of the structure of the fan blades 4, the fan blades 4 can be (but not limited to): an axial flow fan or a diagonal flow fan. In a specific application process, the required fan blades 4 can be selected according to the needs of a specific application scenario, which is not limited here.

[0038] In some embodiments, the first air outlet 24 has a multiplexed function. For example, the first air outlet 24 can be used as a wiring hole for the motor assembly 3. Depending on the specific application scenario, other functions of the first air outlet 24 are not listed here one by one. However, it should be noted that: no matter what different uses the holes and gaps opened on the assembly seat 2 have, as long as they have the function of ventilation and air flow, they belong to the first air outlet 24 referred to in this embodiment.

[0039] In some embodiments, there are two or more first air outlet holes 24 .

[0040] In this embodiment, the internal assembly gap refers to the general term for the space inside the motor assembly that can provide airflow, including (but not limited to): the coupling gap H3, the coil gap H5 or the separation gap between the strip magnetic rings (not shown).

[0041] In the above-mentioned embodiment, the fan blades 4 rotate under the drive of the motor assembly 3, and the rotation of the fan blades 4 further promotes the airflow in the fan housing 1 to move in a directional manner. The airflow belongs to a fluid, and the unique flow characteristics of the fluid will cause the airflow to flow to any airflow channel connected to the external environment. Under the action of wind pressure, the airflow enters the interior of the motor assembly 3 along the air inlet opening of the motor assembly 3, and flows out from the interior of the motor assembly 3 through the internal assembly gap and the first air outlet 24. The above-mentioned flow of the airflow will take away the heat generated by the operation of the motor assembly 3, cool down the motor assembly 3, and play a role in air cooling. Since the first heat dissipation path cools the interior of the motor assembly 3, under the condition of equal air volume, since the temperature inside the motor assembly 3 is higher, more heat is taken away by air cooling, and the heat dissipation effect is more obvious.

[0042] See also Fig.11 , Fig.11 Schematic diagram of the cross-section and gap indication of the fan assembly of this embodiment.

[0043] like Fig.11 As shown, in some embodiments, there is an air inlet gap H1 between the fan blades 4 and the assembly seat 2, there is a second assembly gap H4 between the motor assembly 3 and the assembly seat 2, and a first air outlet hole 24 is opened on the assembly seat 2. The air inlet gap H1, the second assembly gap H4 and the first air outlet hole 24 constitute a second heat dissipation path.

[0044] In some embodiments, the length of the assembly seat 2 is relatively short, and the assembly seat 2 is not sleeved on the motor assembly 3. That is, the motor housing 311 of the motor assembly 3 is exposed, and when the assembly seat 2 is located on one side of the motor assembly 3, the second assembly gap H4 between the motor assembly 3 and the assembly seat 2 is similar to the air inlet gap H1 between the motor assembly 3 and the fan blade 4. At this time, the second assembly gap H4 can serve as the air outlet of the motor assembly 3, and the airflow flowing out of the internal assembly gap can flow out from the second assembly gap H4 and the first air outlet 24.

[0045] In this embodiment, the width of the air inlet gap H1 is determined according to the end-to-end distance between the fan blade 4 and the assembly seat 2. In some embodiments, the air inlet gap H1 is a narrow gap with a short distance, while in other embodiments, the air inlet gap H1 is a wide gap with a long distance.

[0046] In this embodiment, the second assembly gap H4 refers to the distance gap between the inner surface of the assembly seat 2 and the outer surface of one end of the motor assembly 3 inserted into the assembly seat 2.

[0047] See also Figure 6 , Figure 6 FIG. 4 is a schematic diagram of the airflow path of the second heat dissipation path of this embodiment.

[0048] like Figure 6 As shown, the fan blades 4 rotate under the drive of the motor assembly 3, and the fan blades 4 rotate and then promote the airflow in the fan housing 1 to move in a directional manner. The airflow belongs to a fluid, and the unique flow characteristics of the fluid can make the airflow flow to any airflow channel connected to the external environment. There is an air inlet gap H1 between the fan blades 4 and the assembly seat 2, and there is a second assembly gap H4 between the motor assembly 3 and the assembly seat 2. The assembly seat 2 is provided with a first air outlet 24. The air inlet gap H1, the second assembly gap H4 and the first air outlet 24 form a complete airflow channel leading to the external environment. When the motor assembly 3 is working, heat will be generated. If this heat is not dissipated in time, it will affect the normal operation of the motor assembly 3, and seriously cause the fan assembly to be damaged or burned. The airflow flows along the second heat dissipation path composed of the air inlet gap H1, the second assembly gap H4 and the first air outlet 24, which will take away the heat generated by the motor assembly 3 during operation, cool down the motor assembly 3, and play a role of air cooling.

[0049] In some embodiments, the motor assembly 3 is a three-phase motor, which has a higher rotation speed, thereby increasing the air output rate and air output volume of the fan assembly.

[0050] In some embodiments, the motor assembly 3 is powered by batteries, and the power supply batteries of the motor assembly 3 can be two, three, four or more batteries connected in series.

[0051] In some embodiments, the rated operating voltage of the motor assembly 3 is 6-8.4 V or 9-12.6 V. When the rated operating voltage of the motor assembly 3 is 6-8.4 V, the motor assembly 3 is powered by two batteries connected in series. Under the rated operating voltage range, the rated operating current corresponding to the motor assembly 3 is 0.1-2.9 A, the rated power corresponding to the motor assembly 3 is 0.6-25 W, and the speed of the motor assembly 3 is 14000-46000 rpm.

[0052] When the rated working voltage of the motor assembly 3 is 9-12.6V, the motor assembly 3 is powered by three batteries connected in series. Within the rated working voltage range, the corresponding rated working current of the motor assembly 3 is 0.08-2.7A, the corresponding rated power of the motor assembly 3 is 0.7-33W, and the rotation speed of the motor assembly 3 is 14000-48000 rpm.

[0053] When the motor assembly 3 is a three-phase motor and is powered by a battery, the high-speed rotating motor assembly 3 tends to generate a large amount of heat energy in the motor assembly 3 and the assembly seat 2. By introducing part of the high-pressure airflow generated by the fan blades into the second heat dissipation path, the motor assembly 3 and the assembly seat 2 are cooled, making the working state of the three-phase motor more stable.

[0054] See also Figure 3 , Figure 3 Schematic diagram of the exploded view of the fan assembly of this embodiment.

[0055] like Figure 3 As shown, in some embodiments, the assembly seat 2 includes: a connecting cylinder 21, a connecting ring 22 and a hollow tube 23, the connecting cylinder 21 is connected to the fan housing 1 through a plurality of stationary blades 11, one end of the motor assembly 3 is inserted into the connecting cylinder 21, and a second assembly gap H4 is provided between the connecting cylinder 21 and the motor assembly 3. The connecting ring 22 is disposed in the connecting cylinder 21, the hollow tube 23 is connected to the connecting ring 22, and the motor assembly 3 is connected to the hollow tube 23.

[0056] The connection methods between the hollow tube 23 and the connecting ring 22 include (but are not limited to): integral molding, plug-in connection, snap-on connection, interference fit, welding, screw connection, adhesive connection, etc.

[0057] In some embodiments, the motor assembly 3 includes: a motor stator 32 and a motor rotor 31, the motor stator 32 is connected to the assembly seat 2, the motor rotor 31 is sleeved on the motor stator 32, one end of the motor rotor 31 is inserted into the assembly seat 2, and a second assembly gap H4 is provided between the motor rotor 31 and the assembly seat 2.

[0058] The motor stator 32 includes an iron core 322 and a plurality of coils 321 wound on the iron core 322. Since each coil 321 is independently wound on the iron core 322, the gaps between the coils 321 and the iron core 322 cannot be completely filled, so there will be coil gaps on the motor stator 32.

[0059] The motor rotor 31 includes: a rotating shaft 313, a magnetic ring 312 and a motor housing 311. One end of the rotating shaft 313 is inserted into the hollow tube 23 and fixedly connected with the first bearing 33 and the second bearing 36. The other end of the rotating shaft 313 is connected to the fan blade 4. The motor stator 32 is sleeved on the hollow tube 23 and has an interference fit with the hollow tube 23. The magnetic ring 312 is sleeved on the motor stator 32, and the motor housing 311 is sleeved on the magnetic ring 312. The magnetic ring 312 is magnetically coupled to the motor stator 32, and the motor housing 311 is interference fit with the magnetic ring 312. One end of the motor housing 311 facing the fan blade 4 is connected to the rotating shaft 313 by interference fit.

[0060] See also Fig. 9 , Fig. 9 Schematic diagram of the structure of the motor housing of this embodiment.

[0061] like Fig. 9 As shown, in some embodiments, a second assembly gap H4 is provided between the motor housing 311 and the assembly seat 2 , one end of the motor housing 311 is inserted into the assembly seat 2 , and an air inlet opening 314 is provided at one end of the motor housing 311 facing the fan blades 4 .

[0062] In some embodiments, the magnetic ring 312 is composed of a plurality of independent magnetic strips, which are connected to the motor housing by gluing, welding, clamping, etc.

[0063] See also Fig.10 , Fig.10 Schematic diagram of the coil structure and gap indication of this embodiment.

[0064] like Fig.10 As shown, in some embodiments, an air inlet opening 314 is provided on the motor rotor 31, a coil gap H5 is provided between the motor stators 32, and the air inlet opening 314, the coil gap H5 and the first air outlet 24 constitute a first heat dissipation path.

[0065] The number of the air inlet openings 314 in this embodiment is 4. However, the number of the air inlet openings 314 is not limited thereto, and according to different specific application scenarios, in some embodiments, the number of the air inlet openings 314 can be (not limited to): 1, 2, 3, 5 or more.

[0066] The air inlet opening 314, the coil gap H5 and the first air outlet 24 form a complete air flow channel leading to the external environment. The airflow flows along the first heat dissipation path formed by the air inlet opening 314, the coil gap H5 and the first air outlet 24, which will take away the heat generated by the operation of the motor assembly 3, cool down the motor assembly 3, and play a role in air cooling. Since the first heat dissipation path flows out after passing through the motor stator 32, it is equivalent to cooling the inside of the motor assembly 3. Under the condition of the same air volume, the temperature inside the motor assembly 3 is higher, and the heat taken away by the air cooling inside is more, and the heat dissipation effect is more obvious. The second heat dissipation path and the first heat dissipation path are respectively outside and inside the fan assembly, dissipating the heat of the motor assembly 3, improving the effect of air cooling and heat dissipation, so that the motor assembly 3 can work in a stable and suitable temperature environment, ensuring the working efficiency and stability of the motor assembly 3, and also extending the service life of the motor assembly 3 and the fan assembly.

[0067] In some embodiments, there is also a coupling gap H3 between the motor stator 32 and the magnetic ring 312. The coupling gap H3 is interconnected with the coil gap H5, and the space of the internal assembly gap is expanded, so that the airflow space inside the motor assembly is larger, the airflow is smoother, and the heat dissipation effect is better.

[0068] In some embodiments, when the magnetic ring 312 is composed of a plurality of independent magnetic strips, the magnetic ring 312 forms a separation gap. The separation gap spatially expands the coupling gap H3 and the coil gap H5, making the coupling gap H3 and the coil gap H5 larger, and making the contact area between the first heat dissipation path and the motor assembly 3 larger, and the heat dissipation effect is better.

[0069] When the motor assembly 3 is in working state, the motor rotor 31 rotates around the motor stator 32. The rotation of the motor rotor 31 drives the airflow flowing through the first heat dissipation passage to rotate. The airflow movement path of the first heat dissipation passage is spiral. This movement mode makes the contact area between the airflow and the internal structure of the motor assembly 3 larger, and more heat is taken away, further improving the cooling effect.

[0070] In some embodiments, one end of the motor rotor 31 facing the fan blade 4 is inserted into the fan blade 4, and a first assembly gap H2 is provided between the fan blade 4 and the motor rotor 31. The first assembly gap H2, the air inlet opening 314, the coil gap H5 and the first air outlet 24 constitute a first heat dissipation path.

[0071] The end of the motor housing 311 facing the fan blade 4 is inserted into the fan blade 4, which can reduce the exposed area of ​​the motor housing 311 and reduce the wind resistance inside the fan housing 1. At the same time, since the internal space of the fan blade 4 is reused, the axial length of the fan assembly is reduced, making the spatial structure of the fan assembly more compact and more compact.

[0072] In some embodiments, the fan assembly also includes: a PCB circuit board 5, the PCB circuit board 5 is connected to the end of the assembly base 2 facing away from the fan blades 4, a second air outlet 51 is provided on the PCB circuit board 5 and / or the assembly base 2, and the first air outlet 24 is connected to the second air outlet 51.

[0073] The PCB circuit board 5 is connected to the connecting tube 21 of the assembly seat 2. The connection between the PCB circuit board 5 and the connecting tube 21 is a screw connection. However, the connection between the PCB circuit board 5 and the connecting tube 21 is not limited thereto. According to different specific application scenarios, in some embodiments, the connection between the PCB circuit board 5 and the connecting tube 21 includes (but is not limited to): clamping, welding, riveting, adhesive fixation, etc. The connection between the PCB circuit board 5 and the connecting tube 21 can be determined according to the needs of the specific implementation method, and is not limited to the specific embodiment.

[0074] In some embodiments, when the size of the cross section of the PCB circuit board 5 is the same as that of the mounting seat 2, or is larger than that of the cross section of the mounting seat 2, the PCB circuit board 5 is covered on the mounting seat 2. In order to prevent the PCB circuit board 5 from closing the second heat dissipation path, the first heat dissipation path and the third heat dissipation path, a second air outlet 51 is provided on the PCB circuit board 5 and / or the mounting seat 2.

[0075] In some embodiments, the second air outlet 51 provided on the PCB circuit board 5 has a multiplexing function. For example, the second air outlet 51 can be used as a wiring hole of the PCB circuit board 5. Depending on the specific application scenario, other functions of the second air outlet 51 are not listed here one by one. However, it should be noted that: no matter what different uses the holes and gaps provided on the PCB circuit board 5 have, as long as they have the function of ventilation and air flow, they belong to the second air outlet 51 referred to in this embodiment.

[0076] In some embodiments, the second air outlet 51 is opened on the side wall of the connecting tube 21 .

[0077] In some embodiments, the PCB circuit board 5 and the assembly seat 2 are both provided with a second air outlet 51 .

[0078] In some embodiments, when the size of the PCB circuit board 5 is smaller than the size of the cross section of the mounting seat 2 , or the PCB circuit board 5 is mounted above the mounting seat 2 , the second air outlet 51 is a gap between the PCB circuit board 5 and the mounting seat 2 .

[0079] The PCB circuit board 5 will also generate heat when in operation, and heat accumulation will also cause the working performance of the PCB circuit board 5 to decline, or even cause a fire. The PCB circuit board 5 is connected to the end of the assembly seat 2 that is away from the fan blades 4, and a second air outlet 51 is provided on the PCB circuit board 5 and / or the assembly seat 2. The first air outlet 24 is connected to the second air outlet 51, and the airflow blown out of the second heat dissipation path, the first heat dissipation path, and the third heat dissipation path will flow out through the second air outlet 51. During this flow process, the airflow will take away the heat generated by the PCB circuit board 5, cool the PCB circuit board 5, ensure the stability of the working environment of the PCB circuit board 5, and extend the service life of the PCB circuit board 5.

[0080] In some embodiments, a plurality of connecting baffles are provided at one end of the assembly seat 2 connected to the PCB circuit board 5, and a baffle gap is provided between adjacent connecting baffles among the plurality of connecting baffles. The PCB circuit board 5 is covered on the plurality of connecting baffles, and the PCB circuit board 5 and the baffle gap enclose a second air outlet 51.

[0081] The second air outlet 51 is formed by the PCB circuit board 5 and the gap between the baffles, and the airflow blown out from the first air outlet 24 first contacts the PCB circuit board 5, and then blows out from the second air outlet 51 along the PCB circuit board 5. In this process, the contact area and time between the airflow and the PCB circuit board 5 are increased, thereby improving the heat dissipation efficiency and making the cooling effect more significant.

[0082] In some embodiments, the outer diameter of the mounting seat 2 is the same as the maximum outer diameter of the hub 41 of the fan blade 4. The maximum outer diameter of the hub 41 is usually located at the end of the hub 41 close to the connecting tube 21. The outer diameter of the mounting seat 2 is the same as the maximum outer diameter of the hub 41, which can minimize the wind resistance coefficient inside the fan housing 1 and improve the air outlet efficiency of the fan assembly.

[0083] See also Figure 4 , Figure 4 Schematic diagram of the structure of the fan housing of this embodiment.

[0084] like Figure 4 As shown, a fan assembly comprises: a fan housing 1, a motor assembly 3, an assembly seat 2 and a fan blade 4. The motor assembly 3 is assembled in the fan housing 1; the assembly seat 2 is arranged in the fan housing 1, the assembly seat 2 is connected to the fan housing 1 through a plurality of stationary blades 11, the motor assembly 3 is connected to the assembly seat 2; the fan blade 4 is connected to the motor assembly 3; and a guide serration 111 is formed on one end of the plurality of stationary blades 11 facing the fan blade 4.

[0085] The guide serrations 111 are composed of alternating "V"-shaped notches and "V"-shaped tooth marks. In some embodiments, in order to reduce the aerodynamic noise of the guide serrations 111, the intersection of the "V"-shaped notches is smoothed, and the vertex of the "V"-shaped tooth marks is also smoothed.

[0086] In the above embodiment, a plurality of stationary blades 11 are arranged between the fan housing 1 and the assembly seat 2, and a guide serration 111 is formed at one end of each stationary blade 11 facing the fan blade 4. The airflow flowing out of the fan blade 4 has rotational potential energy, and the airflow with rotational potential energy will form a vortex. The guide serration 111 is arranged on the stationary blade 11. When the guide serration 111 contacts the vortex, the larger vortex is broken into multiple smaller vortices. When the smaller vortex collides with the stationary blade 11, the rotational potential energy is smaller, and the aerodynamic noise formed by the collision is greatly reduced. At the same time, the stationary blade 11 is statically arranged, and the role played is interception and guidance. When the airflow contacts the guide serration 111, the airflow is intercepted and guided, and part of the airflow flows to the next stationary blade 11 through the gap of the guide serration 111. Because this part of the airflow has a longer movement space, the position where it contacts and collides with the next stationary blade 11 is located behind the guide serration 111 of the stationary blade 11. The guide serrations 111 can move the collision position of part of the airflow with the stationary blades 11 backward, disperse the total potential energy of the collision contact at the same position, and further reduce the aerodynamic noise of the fan assembly.

[0087] In some embodiments, a plurality of moving blades 42 are disposed on the fan blade 4 , and a trailing edge serration 421 is disposed at one end of the plurality of moving blades 42 facing the assembly seat 2 .

[0088] The fan blade 4 further includes a hub 41 , and a plurality of moving blades 42 are arranged around the hub 41 .

[0089] The guide serrations 111 are arranged on the stationary blades 11, and the trailing edge serrations 421 are arranged on the moving blades 42. Since the airflow has rotational potential energy when it flows, and the rotation direction of the potential energy is the same as the rotation direction of the moving blades 42, the cutting of the vortex by the trailing edge serrations 421 of the moving blades 42 is the same direction cutting. The cutting of the vortex by the guide serrations 111 arranged on the stationary blades 11 is the static interception cutting, which has a higher cutting efficiency and a more obvious breaking effect on the vortex.

[0090] In this embodiment, the number of the moving blades 42 is 9. However, the number of the moving blades 42 is not limited thereto. Depending on the specific application scenario, the number of the moving blades 42 can be 2, 3, 4, 5, 6, 8 or more. The number of the moving blades 42 can be determined according to the needs of the specific application scenario and is not limited to the specific embodiment.

[0091] The trailing edge serrations 421 are composed of alternating "V"-shaped notches and "V"-shaped tooth marks. In some embodiments, in order to reduce the aerodynamic noise of the trailing edge serrations 421, the intersection of the "V"-shaped notches is smoothed, and the vertex of the "V"-shaped tooth marks is also smoothed.

[0092] When the fan blade 4 rotates, a vortex is generated at the trailing edge of the blade tail. A trailing edge serration 421 is provided on the moving blade 42. When the trailing edge serration 421 comes into contact with the vortex, a larger vortex is broken up into multiple smaller vortices, and the aerodynamic noise formed by the smaller vortices is greatly reduced.

[0093] When the trailing edge serrations 421 are provided on the moving blades 42 and the guide serrations 111 are provided on the stationary blades 11 at the same time, the guide serrations 111 can break up and decompose the outflowing vortex, and the guide serrations 111 on the stationary blades 11 further decompose the broken up and decomposed vortex. The two breaking up and decomposition processes miniaturize the vortex inside the fan assembly and minimize the aerodynamic noise of the fan assembly.

[0094] In some embodiments, each of the multiple stationary blades 11 is bent and extended along the inner surface of the fan housing 1, and the multiple moving blades 42 are bent and extended along the surface of the hub 41 of the fan blades 4, and the bending direction of the multiple stationary blades 11 is opposite to the rotation direction of the multiple moving blades 42.

[0095] In this embodiment, the bending direction of the stationary blade 11 is opposite to the rotation direction of the moving blade 42, which means that the bending direction of the stationary blade 11 is opposite to the rotation direction of the moving blade 42, and is not limited to the specific embodiment in which the bending direction of the stationary blade 11 is 180° to the rotation direction of the moving blade 42. In some embodiments, when the bending extension line of the stationary blade 11 is at an obtuse angle to the rotation direction of the moving blade 42, it is also within the opposite coverage defined in this embodiment.

[0096] The bending direction of the stationary blades 11 is opposite to the rotation direction of the moving blades 42. When the moving blades 42 rotate, the airflow will be driven to rotate in the same direction. At this time, the bending direction of the stationary blades 11 is opposite to the rotation direction of the airflow. When the airflow rotates, it contacts and collides with the curved part of the stationary blades 11. Since the directions are opposite, the angle between the airflow and the curved part of the stationary blades 11 is greater than 90 degrees. The airflow contacts the stationary blades 11 at a larger angle, which can reduce the kinetic energy loss of the airflow contacting the stationary blades 11. During the contact process at a larger angle, the stationary blades 11 have an obvious guiding effect on the airflow, with less energy loss, which greatly improves the air outlet efficiency.

[0097] In some embodiments, the tooth marks of the guide serrations 111 are tilted. The guide serrations 111 are arranged between the fan housing 1 and the assembly seat 2, so that the tooth marks of the guide serrations 111 can be tilted from the fan housing 1 to the assembly seat 2, and can also be tilted from the assembly seat 2 to the fan housing 1.

[0098] In some embodiments, the tooth marks of the trailing edge serrations 421 are tilted. The trailing edge serrations 421 are disposed between the fan housing 1 and the assembly seat 2, so that the tooth marks of the trailing edge serrations 421 can be tilted from the fan housing 1 toward the assembly seat 2, and can also be tilted from the assembly seat 2 toward the fan housing 1.

[0099] In some embodiments, the tooth marks of the guide serrations 111 are arranged obliquely, and the tooth marks of the trailing edge serrations 421 are also arranged obliquely.

[0100] In some embodiments, the tooth marks of the guide serrations 111 and the tooth marks of the trailing edge serrations 421 have the same inclination direction.

[0101] When the inclination directions of the tooth marks of the guide serration 111 and the trailing edge serration 421 are consistent, the guide serration 111 and the trailing edge serration 421 can perform secondary decomposition on the airflow with the same flow direction, making the decomposition effect of the vortex pointed in the inclination direction more obvious.

[0102] In some embodiments, the tooth marks of the guide serrations 111 and the tooth marks of the trailing edge serrations 421 are inclined in opposite directions.

[0103] When the inclination directions of the tooth marks of the guide serration 111 and the trailing edge serration 421 are opposite, the guide serration 111 and the trailing edge serration 421 can respectively break up and decompose the vortex directed by their inclination directions, so that the vortex area broken up and decomposed by the guide serration 111 and the trailing edge serration 421 is wider.

[0104] In some embodiments, the tooth marks of the guide serrations 111 are inclined toward the fan housing 1 , and the tooth marks of the trailing edge serrations 421 are inclined toward the fan housing 1 .

[0105] The direction of the airflow flowing out of the fan blades 4 is the spiral motion of the fan blades 4 toward the fan housing 1. The tooth marks of the guide sawtooth 111 are inclined toward the fan housing 1, so that the inclination direction of the tooth marks of the guide sawtooth 111 is consistent with the flow direction of the airflow, increasing the contact area between the tooth marks of the guide sawtooth 111 and the airflow, making the tooth marks of the guide sawtooth 111 more efficient in breaking up and decomposing the airflow. The tooth marks of the corresponding trailing edge sawtooth 421 are also inclined toward the fan housing 1, so that the inclination direction of the tooth marks of the trailing edge sawtooth 421 is consistent with the flow direction of the airflow, increasing the contact area between the tooth marks of the trailing edge sawtooth 421 and the airflow, making the tooth marks of the trailing edge sawtooth 421 more efficient in breaking up and decomposing the airflow. At the same time, since the inclination directions of the two are the same as the flow direction of the airflow, the wind resistance of the guide sawtooth 111 and the trailing edge sawtooth 421 to the airflow is reduced, and the air outlet efficiency is improved. The tooth marks of the guide serrations 111 and the trailing edge serrations 421 are both inclined toward the fan housing 1, which can perform secondary decomposition on the airflow with the same flow direction, making the decomposition effect of the vortex pointed in the inclined direction more obvious.

[0106] In some embodiments, the tooth marks of the guide serrations 111 are inclined toward the fan housing 1 , and the tooth marks of the trailing edge serrations 421 are inclined toward the assembly seat 2 .

[0107] The direction of the airflow flowing out of the fan blades 4 is the spiral motion of the fan blades 4 toward the fan housing 1. The tooth marks of the guide sawtooth 111 are inclined toward the fan housing 1, so that the inclination direction of the tooth marks of the guide sawtooth 111 is consistent with the flow direction of the airflow, increasing the contact area between the tooth marks of the guide sawtooth 111 and the airflow, making the tooth marks of the guide sawtooth 111 more efficient in breaking up and decomposing the airflow. The tooth marks of the trailing edge sawtooth 421 are inclined toward the assembly seat 2, and their inclination direction is opposite to the direction of airflow movement. The tooth marks set in reverse can decompose and break up the laterally moving airflow multiple times, and the decomposition and break up of the vortex is more thorough. At the same time, the guide sawtooth 111 and the trailing edge sawtooth 421 can respectively break up and decompose the vortex pointed to by their inclination directions, so that the vortex area broken up and decomposed by the guide sawtooth 111 and the trailing edge sawtooth 421 is wider.

[0108] In some embodiments, the tooth marks of the guide serrations 111 are inclined toward the mounting seat 2, and the tooth marks of the trailing edge serrations 421 are inclined toward the fan housing 1. The guide serrations 111 and the trailing edge serrations 421 can respectively break up and decompose the eddy currents pointed to by the inclination directions thereof, so that the eddy current areas broken up and decomposed by the guide serrations 111 and the trailing edge serrations 421 are wider.

[0109] In some embodiments, the tooth marks of the guide serrations 111 and the tooth marks of the trailing edge serrations 421 are both inclined toward the assembly seat 2 .

[0110] In some embodiments, the tooth marks of the guide serrations 111 correspond to the tooth marks of the trailing edge serrations 421 .

[0111] In the present embodiment, the tooth marks of the guide saw tooth 111 and the tooth marks of the trailing edge saw tooth 421 correspond to each other, which means that the tooth mark of the trailing edge saw tooth 421 is arranged at the position where the extension line of the tooth mark of the guide saw tooth 111 intersects with the trailing edge saw tooth 421; conversely, the tooth mark of the guide saw tooth 111 is arranged at the position where the extension line of the tooth mark of the trailing edge saw tooth 421 intersects with the guide saw tooth 111.

[0112] The tooth marks of the guide saw teeth 111 correspond to the tooth marks of the trailing edge saw teeth 421, and the tooth marks of the trailing edge saw teeth 421 have the function of dividing the airflow. The divided airflow will be re-converged when it reaches the guide saw teeth 111, and the converged airflow will be dispersed and divided again by the tooth marks of the guide saw teeth 111, so as to avoid the vortex from re-converging and improving the vortex division effect.

[0113] In some embodiments, the tooth marks of the guide serrations 111 and the tooth marks of the trailing edge serrations 421 are staggered with each other.

[0114] In the present embodiment, the tooth marks of the guide saw tooth 111 and the tooth marks of the trailing edge saw tooth 421 are staggered with each other, which means that a notch of the trailing edge saw tooth 421 is provided at the position where the extension line of the tooth mark of the guide saw tooth 111 intersects with the trailing edge saw tooth 421; conversely, a notch of the guide saw tooth 111 is provided at the position where the extension line of the tooth mark of the trailing edge saw tooth 421 intersects with the guide saw tooth 111.

[0115] The tooth marks of the guide serrations 111 and the tooth marks of the trailing edge serrations 421 are staggered with each other. The tooth marks of the trailing edge serrations 421 and the tooth marks of the guide serrations 111 both have the function of dividing the airflow. The staggered arrangement of the two can separate the vortices at different positions, increase the dividing area of ​​the vortex, and further reduce the aerodynamic noise.

[0116] In some embodiments, the ratio of the length of the stationary blade 11 to the length of the moving blade 42 is 1.1-2.8. The length of the stationary blade 11 refers to the length from one end of the stationary blade 11 where the guide serrations 111 are provided to the other end opposite thereto. The length of the moving blade 42 refers to the length from one end of the moving blade 42 where the trailing edge serrations 421 are provided to the other end opposite thereto.

[0117] Under the above length ratio, the length of the stationary blade 11 is greater than the length of the moving blade 42. When the fan blade 4 rotates, the moving blade 42 is used to restrain and guide the airflow. If the distance of the moving blade 42 is too long, the rotational potential energy of the airflow will be too large. The main function of the stationary blade 11 is to offset and convert the rotational potential energy of the airflow, so that it moves horizontally along the stationary blade 11. If the length of the stationary blade 11 is too short, the rotational potential energy of the airflow out of the fan assembly will be too large, the directional movement ability will be poor, and the directional air supply distance will be short.

[0118] By setting the ratio of the length of the stationary blades 11 to the length of the moving blades 42 between 1.1 and 2.8, the rotational potential energy of the airflow flowing out of the fan blades 4 can be fully offset and converted when passing through the moving blades 42, thereby improving the overall air outlet efficiency and directional air supply capability of the fan assembly. At the same time, the airflow is blown out from the fan blades 4 and guided by the stationary blades 11. During this process, due to the setting of the assembly seat 2, the airflow flow space is compressed, and the airflow is pressurized and accelerated. The length of the stationary blades 11 is relatively large, corresponding to the path length required for its acceleration, thereby improving the airflow acceleration efficiency.

[0119] When the ratio of the two is less than 1.1, the rotational potential energy of the airflow blown out by the fan assembly is too large, the diffusion surface after the airflow is blown out is too large, and the directional air supply capacity is reduced. When the ratio of the two is greater than 2.8, the energy loss of the fan assembly in the fan housing 1 is too large, the initial kinetic energy of the airflow at the air outlet of the fan assembly is reduced, and the directional air supply capacity of the fan assembly is also reduced.

[0120] In some embodiments, the ratio of the number of stationary blades 11 to the number of moving blades 42 is 0.5-1.

[0121] When the ratio of the number of stationary blades 11 to the number of moving blades 42 is within a numerical range, the air volume and air pressure of the fan assembly can be increased, so that the wind speed of the airflow blown out by the fan assembly is greater. When the ratio of the number of stationary blades 11 to the number of moving blades 42 is less than 0.5, the number of stationary blades 11 is too small, and the stationary blades 11 do not fully offset and convert the rotational potential energy of the airflow, thereby reducing the directional air supply capability of the fan assembly. When the ratio of the number of stationary blades 11 to the number of moving blades 42 is greater than 1, the number of stationary blades 11 is too large, which increases the wind resistance of the airflow and reduces the conversion efficiency of the airflow.

[0122] See also Fig.12 , Fig.12 Schematic diagram of the hollow tube structure in this embodiment.

[0123] like Fig.12As shown, a fan assembly comprises: a fan housing 1, an assembly seat 2 and a motor assembly 3. The assembly seat 2 is arranged in the fan housing 1, and the assembly seat 2 is connected to the fan housing 1 through a plurality of stationary blades 11; the motor assembly 3 is assembled in the fan housing 1; the assembly seat 2 is provided with a hollow tube 23, the motor assembly 3 is connected to the hollow tube 23, a first bearing 33 and a support member 35 are arranged in the hollow tube 23, one end of the rotating shaft 313 of the motor assembly 3 is inserted into and passes through the support member 35 and the first bearing 33 in sequence, the other end of the rotating shaft 313 extends out of the hollow tube 23, the fan blade 4 is connected to one end of the rotating shaft 313 extending out of the hollow tube 23, a first elastic member 34 is compressed and arranged between the first bearing 33 and the support member 35, one end of the first elastic member 34 is connected to the support member 35, and the other end of the first elastic member 34 is connected to the first inner ring or the first outer ring of the first bearing 33.

[0124] In some embodiments, the assembly seat 2 only includes: a hollow tube 23 . One end of the plurality of stationary blades 11 is connected to the hollow tube 23 , and the other ends of the plurality of stationary blades 11 are radially distributed and connected to the fan housing 1 .

[0125] In some embodiments, the assembly seat 2 includes: a connecting cylinder 21, a connecting ring 22 and a hollow tube 23, the connecting cylinder 21 is arranged in the fan housing 1, the connecting cylinder 21 is connected to the fan housing 1 through a plurality of stationary blades 11, the connecting ring 22 is arranged in the connecting cylinder 21, the hollow tube 23 is connected to the connecting ring 22, and the motor assembly 3 is connected to the hollow tube 23.

[0126] In some embodiments, the assembly seat 2 includes: a connecting ring 22 and a hollow tube 23 , the connecting ring 22 is connected to the fan housing 1 through a plurality of stationary blades 11 , the hollow tube 23 is connected to the connecting ring 22 , and the motor assembly 3 is connected to the hollow tube 23 .

[0127] The connection methods between the hollow tube 23 and the connecting ring 22 include (but are not limited to): integral molding, plug-in connection, snap-on connection, interference fit, welding, screw connection, adhesive connection, etc.

[0128] In this embodiment, the first elastic member 34 is (but not limited to): a coil spring and a rubber spring. The material and structure of the first elastic member 34 can be determined according to the requirements of a specific application scenario and are not limited to the specific embodiment.

[0129] The first elastic member 34 is sleeved on the rotating shaft 313. However, the arrangement of the first elastic member 34 is not limited thereto, and according to different specific application scenarios, in some embodiments, a plurality of first elastic members 34 are provided, and the plurality of first elastic members 34 are arranged around the rotating shaft 313 and are respectively connected to the support member 35 and the first bearing 33.

[0130] In this embodiment, the first bearing 33 is disposed at the first hollow end 231 of the hollow tube 23 . However, the location of the first bearing 33 is not limited thereto. In some embodiments, the first bearing 33 is disposed at the second hollow end 232 of the hollow tube 23 .

[0131] In this embodiment, the connection method between the first elastic member 34 and the support member 35 includes (but is not limited to): abutment, welding, adhesive connection or integral molding.

[0132] In this embodiment, the connection method between the first elastic member 34 and the first bearing 33 includes (but is not limited to): abutment, welding or adhesive connection.

[0133] In some embodiments, the motor assembly 3 is a three-phase motor, which has a higher rotation speed, thereby increasing the air output rate and air output volume of the fan assembly.

[0134] In some embodiments, the motor assembly 3 is powered by batteries, and the power supply batteries of the motor assembly 3 can be two, three, four or more batteries connected in series.

[0135] In some embodiments, the rated operating voltage of the motor assembly 3 is 6-8.4 V or 9-12.6 V. When the rated operating voltage of the motor assembly 3 is 6-8.4 V, the motor assembly 3 is powered by two batteries connected in series. Under the rated operating voltage range, the rated operating current corresponding to the motor assembly 3 is 0.1-2.9 A, the rated power corresponding to the motor assembly 3 is 0.6-25 W, and the speed of the motor assembly 3 is 14000-46000 rpm.

[0136] When the rated working voltage of the motor assembly 3 is 9-12.6V, the motor assembly 3 is powered by three batteries connected in series. Within the rated working voltage range, the corresponding rated working current of the motor assembly 3 is 0.08-2.7A, the corresponding rated power of the motor assembly 3 is 0.7-33W, and the rotation speed of the motor assembly 3 is 14000-48000 rpm.

[0137] When the motor assembly 3 is a three-phase motor and is powered by a battery, the high-speed rotating motor assembly 3 is easily affected by slight vibrations, resulting in large aerodynamic noise and abnormal vibrations in the fan assembly. The first elastic member 34 is arranged to abut against the first bearing 33 to reduce abnormal vibrations caused by bearing structural design defects or errors, greatly reduce the aerodynamic noise of the fan assembly, and improve the stability of the fan assembly rotation.

[0138] In the above embodiment, the first elastic member 34 is arranged between the support member 35 and the first bearing 33, and one end of the elastic member is connected to the support member 35, and the other end of the elastic member is connected to the first inner ring or the first outer ring of the first bearing 33. The first elastic member 34 is compressed between the first bearing 33 and the support member 35, so that the first inner ring or the first outer ring of the first bearing 33 is always subjected to elastic force. After the first inner ring or the first outer ring is subjected to force, the first bearing 33 is always in a state of bridging the axial gap between the first inner ring and the first outer ring, that is, the balls between the first inner ring and the first outer ring are always clamped, and the axial gap between the first inner ring and the first outer ring is the smallest. In the above state, the problem of the shaft 313 of the motor assembly 3 moving up and down along the axial direction when rotating can be reduced, the vibration frequency of the fan blade 4 is greatly reduced, and the abnormal noise caused by the displacement of the inner ring and the outer ring of the fan assembly disappears. At the same time, the wear of the first bearing 33 can be reduced, and the service life of the first bearing 33 can be extended.

[0139] In some embodiments, the fan assembly also includes: a second bearing 36, the first bearing 33 and the second bearing 36 are respectively arranged at both ends of the hollow tube 23, the support member 35 is arranged between the first bearing 33 and the second bearing 36, and one end of the rotating shaft 313 is inserted into and passes through the second bearing 36, the support member 35 and the first bearing 33 in sequence.

[0140] The arrangement of the first bearing 33 and the second bearing 36 can make the rotating shaft 313 rotate more smoothly. At the same time, the arrangement of the two rotating shafts 313 makes the linear rotation of the rotating shaft 313 more stable, which can make the rotation speed of the fan motor faster.

[0141] In some embodiments, the first supporting end 351 of the supporting member 35 abuts against the second inner ring or the second outer ring of the second bearing 36 , and the second supporting end 352 of the supporting member 35 is connected to the first elastic member 34 .

[0142] In order to avoid axial displacement between the inner ring and the outer ring of the second bearing 36, the first support end 351 of the support member 35 abuts against the second inner ring or the second outer ring of the second bearing 36. The second outer ring or the second inner ring of the second bearing 36 is abutted by the support member 35, which can also make the second inner ring or the second outer ring of the second bearing 36 always be subjected to an external force in the axial direction to make it close to each other. After the second inner ring or the second outer ring is subjected to force, the second bearing 36 is always in a state of bridging the axial gap between the second inner ring and the second outer ring, that is, the balls between the second inner ring and the second outer ring are always clamped, and the axial gap between the second inner ring and the second outer ring is the smallest. In the above state, the problem of the shaft 313 of the motor assembly 3 moving up and down along the axial direction when rotating can be reduced, the vibration frequency of the fan blade 4 is greatly reduced, and the abnormal noise caused by the displacement of the inner ring and the outer ring of the fan assembly disappears. At the same time, the wear of the second bearing 36 can be reduced and the service life of the second bearing 36 can be extended.

[0143] In some embodiments, a second elastic member (not shown) is compressed between the support member 35 and the second bearing 36 , one end of the second elastic member is connected to the first support end 351 of the support member 35 , and the other end of the second elastic member is connected to the second inner ring and the second outer ring of the second bearing 36 .

[0144] In this embodiment, the second elastic member is (but not limited to): a coil spring and a rubber spring. The material and structure of the second elastic member can be determined according to the requirements of a specific application scenario and are not limited to the specific embodiment.

[0145] The second elastic member is sleeved on the rotating shaft 313. However, the arrangement of the second elastic member is not limited thereto, and according to different specific application scenarios, in some embodiments, a plurality of second elastic members are provided, and the plurality of second elastic members are arranged around the rotating shaft 313 and are respectively connected to the support member 35 and the second bearing 36.

[0146] In this embodiment, the second bearing 36 is arranged at the second hollow end 232 of the hollow tube 23, but the setting position of the second bearing 36 is not limited thereto. In some embodiments, the positions of the first bearing 33 and the second bearing 36 can be interchanged, and the second bearing 36 is arranged at the first hollow end 231 of the hollow tube 23.

[0147] In some embodiments, the second elastic member can be disposed between the second bearing and the motor housing 311 , with one end of the second elastic member abutting against the inner ring or the outer ring of the second bearing, and the other end being connected to the motor housing 311 .

[0148] In order to avoid the axial displacement between the inner ring and the outer ring of the second bearing 36, a second elastic member is arranged between the support member 35 and the second bearing 36, one end of the second elastic member is connected to the second support end 352 of the support member 35, and the other end of the second elastic member is connected to the second inner ring or the second outer ring of the second bearing 36. The second outer ring or the second inner ring of the second bearing 36 is connected with the second elastic member after being compressed, which can also make the second inner ring or the second outer ring of the second bearing 36 always be subjected to the external force in the axial direction to make them close to each other. After the second inner ring or the second outer ring is subjected to the force, the second bearing 36 is always in a state of bridging the axial gap between the second inner ring and the second outer ring, that is, the ball between the second inner ring and the second outer ring is always clamped, and the axial gap between the second inner ring and the second outer ring is the smallest. In the above state, the problem of the shaft 313 of the motor assembly 3 moving up and down along the axial direction when rotating can be reduced, the vibration frequency of the fan blade 4 is greatly reduced, and the abnormal noise of the fan assembly caused by the displacement of the inner ring and the outer ring of the bearing disappears. At the same time, the wear of the second bearing 36 can be reduced and the service life of the second bearing 36 can be extended.

[0149] The second elastic member is arranged between the second bearing and the motor housing 311, which can also play the role of minimizing the axial gap between the second inner ring and the second outer ring.

[0150] In this embodiment, the connection method between the second elastic member and the support member 35 includes (but is not limited to): abutment, welding, adhesive connection or integral molding.

[0151] In this embodiment, the connection method between the second elastic member and the second bearing 36 includes (but is not limited to): abutment, welding or adhesive connection.

[0152] In some embodiments, the support member 35 is interference fit with the hollow tube 23. The support member 35 is interference fit with the hollow tube 23, and the relative position between the support member 35 and the hollow tube 23 is fixed, so that the first elastic member 34 and the second elastic member remain in a compressed state.

[0153] The support member 35 in this embodiment is an independent circular ring structure arranged in the hollow tube 23, and the support member 35 is sleeved on the rotating shaft 313. However, the arrangement of the support member 35 is not limited to this. According to different specific application scenarios, in some embodiments, the support member 35 is a convex block or convex ring formed by internal protrusions in the hollow tube 23.

[0154] See also Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the support structure of this embodiment; Figure 8 Schematic cross-sectional view of the support member of this embodiment.

[0155] like Figure 7and Figure 8 As shown, in some embodiments, the thickness of the first supporting end 351 of the supporting member 35 gradually decreases along the direction from the second supporting end 352 to the first supporting end 351 .

[0156] When the support member 35 is an independently constructed annular structure, the support member 35 needs to be assembled into the hollow tube 23 through the first hollow end 231 or the second hollow end 232, and pushed to a fixed position, and form an interference fit connection with the hollow tube 23 at this position. In order to facilitate the assembly of the support member 35, the first support end 351 as the head structure of the support member 35 needs to have a certain deformation ability to adapt to the smooth assembly when there is an error in the inner diameter of the hollow tube 23. The thickness of the first support end 351 of the support member 35 gradually decreases along the direction from the second support end 352 to the first support end 351. The first support end 351 has the function of facilitating the introduction and assembly. At the same time, the thickness is gradually reduced, so that the first support end 351 has the characteristic of being easier to deform after being pressed, and can adapt to the assembly apertures with errors in different hollow tubes 23 to the maximum extent. Improve the assembly efficiency of the support member 35.

[0157] In some embodiments, the support member 35 is provided with a first deformation notch 353 at the second support end 352. The provision of the first deformation notch enables the second support end 352 of the support member 35 to also have the ability to deform after being squeezed, so that the second support end 352 has the function of convenient introduction and assembly. It can adapt to the assembly apertures with errors in different hollow tubes 23 to the greatest extent. It improves the assembly efficiency of the support member 35. At the same time, when the support member 35 provided with the first deformation notch 353 is subjected to an external force directed from the first support end 351 to the second support end 352, the position where the second support end 352 is connected to the hollow tube 23 will be turned outward toward the direction of the hollow tube 23, forming a trumpet-shaped structure that hinders external forces, thereby improving the assembly stability and external force resistance of the support member 35.

[0158] In some embodiments, the support member 35 is provided with a second deformation notch 354 at the second support end 352. The second deformation notch 354 has the same function as the first deformation notch 353, and will not be described in detail herein.

[0159] In some embodiments, the outer surface of the support member 35 is raised to form a ridge 355. The provision of the ridge 355 reduces the contact area between the support member 35 and the hollow tube 23, and the space between the ridges 355 can be used as a space for the ridges 355 to deform after being stressed, thereby reducing assembly resistance, improving assembly efficiency, and reducing the risk of the support member 35 bursting the hollow tube 23 during assembly.

[0160] In some embodiments, the first deformation notch 353 and the second deformation notch 354 are disposed opposite to each other. The first deformation notch 353 and the second deformation notch 354 are disposed opposite to each other, so that the deformation range of the second support end 352 is maximized.

[0161] In some embodiments, the protrusion height of the protrusion 355 gradually decreases along the direction from the second supporting end 352 to the first supporting end 351 .

[0162] Since the support member 35 is assembled in the direction from the second support end 352 to the first support end 351, the protrusion height of the ridge 355 gradually decreases along the direction from the second support end 352 to the first support end 351, that is, the position with the lowest protrusion height in the ridge 355 first contacts the hollow tube 23 during assembly. The assembly difficulty is reduced, and the assembly resistance gradually increases with the deepening of the assembly depth, thereby reducing the risk of the hollow tube 23 being burst during the assembly process.

[0163] In some embodiments, the end of the ridge 355 facing the first support end 351 smoothly transitions with the surface of the support member 35. Since the support member 35 is assembled with the second support end 352 facing the first support end 351, the end of the ridge 355 facing the first support end 351 smoothly transitions with the surface of the support member 35, which can effectively reduce the assembly resistance and improve the assembly efficiency. At the same time, it can also prevent the protruding foreign matter from scratching the inner wall of the hollow tube 23 during the assembly process.

[0164] In some embodiments, the motor assembly 3 includes: a coil 321 , the coil 321 is sleeved on the hollow tube 23 , and the support member 35 and the second bearing 36 are located at the connection position between the coil 321 and the hollow tube 23 .

[0165] The coil 321 and the sleeve are arranged on the hollow tube 23, and the connection relationship between the two is an interference fit. Since the hollow tube 23 is hollow inside, its force strength is relatively small compared to the solid structure of the same material. When subjected to a large external force, there is a risk of partial collapse. The support member 35 and the second bearing 36 are located at the connection position between the coil 321 and the hollow tube 23, so that the support member 35 and the second bearing 36 support the hollow tube 23, increase the strength of the hollow tube 23, and reduce the risk of the hollow tube 23 collapsing under force.

[0166] In some embodiments, the support member 35 is assembled from the second hollow end 232 of the hollow tube 23 to the first hollow end 231 . Since the assembly direction is opposite, the support member 35 is assembled after being reversed accordingly.

[0167] like Figure 2As shown, a fan assembly comprises: a fan housing 1, an assembly seat 2, a motor assembly 3 and a fan blade 4. The assembly seat 2 is arranged in the fan housing 1, and the assembly seat 2 is connected to the fan housing 1 through a plurality of stationary blades 11; one end of the motor assembly 3 is inserted into the assembly seat 2 and connected to the assembly seat 2; the other end of the motor assembly 3 is inserted into the fan blade 4 and connected to the fan blade 4.

[0168] In some embodiments, the motor assembly 3 is a three-phase motor, which has a higher rotation speed, thereby increasing the air output rate and air output volume of the fan assembly.

[0169] In some embodiments, the motor assembly 3 is powered by batteries, and the power supply batteries of the motor assembly 3 can be two, three, four or more batteries connected in series.

[0170] In some embodiments, the rated operating voltage of the motor assembly 3 is 6-8.4 V or 9-12.6 V. When the rated operating voltage of the motor assembly 3 is 6-8.4 V, the motor assembly 3 is powered by two batteries connected in series. Under the rated operating voltage range, the rated operating current corresponding to the motor assembly 3 is 0.1-2.9 A, the rated power corresponding to the motor assembly 3 is 0.6-25 W, and the speed of the motor assembly 3 is 14000-46000 rpm.

[0171] When the rated working voltage of the motor assembly 3 is 9-12.6V, the motor assembly 3 is powered by three batteries connected in series. Within the rated working voltage range, the corresponding rated working current of the motor assembly 3 is 0.08-2.7A, the corresponding rated power of the motor assembly 3 is 0.7-33W, and the rotation speed of the motor assembly 3 is 14000-48000 rpm.

[0172] When the motor assembly 3 is a three-phase motor and is powered by a battery, the fan assembly not only has requirements on the rotation speed, but also needs to consider the energy consumption of the fan assembly. By improving the assembly structure of the motor assembly 3 and the fan blades 4, the torque required for the rotation of the fan blades 4 is reduced, and the kinetic energy required for the rotation of the fan blades 4 is reduced. In turn, the energy consumption of the fan assembly is reduced, and the fan assembly has a longer endurance. At the same time, due to the reduction in the torque, the rotation posture of the fan blades 4 can be made more stable when rotating at high speed, reducing the probability of abnormal shaking of the fan assembly.

[0173] The high-speed rotating motor assembly 3 easily generates a large amount of heat energy inside the motor assembly 3 and the assembly seat 2. By introducing part of the high-pressure airflow generated by the fan blades into the first heat dissipation path, the motor assembly 3 and the assembly seat 2 are cooled, making the working state of the three-phase motor more stable.

[0174] In the above embodiment, one end of the motor assembly 3 is inserted into the assembly seat 2, and the other end of the motor assembly 3 is inserted into the fan blade 4. This structure makes the fan blade 4 cover a smaller part of the motor assembly 3 than the solution in which the motor assembly 3 is completely inserted into the fan blade 4, thereby reducing the length of the fan blade 4 in the axial direction. The reduction in the axial length of the fan blade 4 shortens the entire fan blade 4 rotation force arm, thereby reducing the rotational torque of the fan blade 4. The rotational torque of the fan blade 4 is reduced, and the fan blade 4 rotates faster under the same output environment of the motor assembly 3. The reduction in the rotational torque of the fan blade 4 will reduce the abnormal centrifugal force caused by the imbalance of the fan blade 4, and the rotation of the fan blade 4 will be more stable, reducing the probability of abnormal vibration of the fan blade 4, and also reducing the rotation noise of the fan blade 4.

[0175] In some embodiments, a connecting shaft column 43 and a plurality of reinforcing ribs 411 are disposed in the fan blade 4. The plurality of reinforcing ribs 411 are disposed around the connecting shaft column 43. The motor assembly 3 abuts against the connecting shaft column 43 and / or the plurality of reinforcing ribs 411 to reduce the rotational torque of the fan blade 4.

[0176] The fan blade 4 comprises: a hub 41 and a plurality of moving blades 42. The plurality of moving blades 42 are spaced apart and distributed on the surface of the hub 41. The hub 41 is hollow inside, and a connecting shaft column 43 is arranged at the center of the hub 41.

[0177] The motor assembly 3 includes: a motor stator 32 and a motor rotor 31. The motor stator 32 is connected to the assembly seat 2. The motor rotor 31 is sleeved on the motor stator 32. One end of the motor rotor 31 is inserted into the assembly seat 2. The motor stator 32 includes: an iron core 322 and a plurality of coils 321 wound around the iron core 322.

[0178] The motor stator 32 includes an iron core 322 and a plurality of coils 321 wound around the iron core 322. The iron core 322 is sleeved on the hollow tube 23.

[0179] The motor rotor 31 includes: a rotating shaft 313, a magnetic ring 312 and a motor housing 311. One end of the rotating shaft 313 is inserted into the hollow tube 23 and fixedly connected with the first bearing 33 and the second bearing 34. The other end of the rotating shaft 313 is connected to the connecting shaft column 43 of the fan blade 4. The motor stator 32 is sleeved on the hollow tube 23 and has an interference fit with the hollow tube 23. The magnetic ring 312 is sleeved on the motor stator 32, and the motor housing 311 is sleeved on the magnetic ring 312. The magnetic ring 312 is magnetically coupled to the motor stator 32, and the motor housing 311 is interference fit with the magnetic ring 312. One end of the motor housing 311 facing the fan blade 4 is connected to the rotating shaft 313 by interference fit.

[0180] One end of the motor housing 311 in the motor assembly 3 is inserted into the assembly seat 2, and the other end is inserted into the hub 41 of the fan blade 4. The end of the motor housing 311 inserted into the fan blade 4 abuts against the connecting shaft column 43 and / or multiple reinforcing ribs 411.

[0181] In this embodiment, when the motor assembly 3 is working, the motor stator 32 first performs electromagnetic conversion to drive the motor housing 311 with the magnetic ring 312 to rotate; then the motor housing 311 drives the rotating shaft 313 to rotate; finally, the rotating shaft 313 drives the fan blades 4 to rotate. One end of the motor housing 311 inserted into the fan blades 4 abuts against the connecting shaft column 43 and / or multiple reinforcing ribs 411. When the motor housing 311 rotates, there is friction between the connecting shaft column 43 and / or multiple reinforcing ribs 411. When the motor housing 311 rotates at the same frequency as the fan blades 4, this friction will be converted into the rotation driving force of the fan blades 4, which is equivalent to increasing the radial contact area between the rotating shaft 313 and the fan blades 4, so that the rotation of the fan blades 4 is more stable.

[0182] In some embodiments, the hub 41 of the fan blade 4 is configured to be conical, truncated, hemispherical or bullet-shaped. This structure allows the force arms between different parts of the hub 41 and the rotating shaft 313 to be of different sizes when the fan blade 4 rotates. The rotation force arm is the largest at the position of the hub 41 where the motor housing 311 is inserted at one end, and the corresponding rotation torque is also larger. The torques at different positions of the hub 41 are different, and excessive torque differences will cause the fan blade 4 to rotate unstably. The end of the motor housing 311 inserted into the fan blade 4 abuts against the connecting shaft column 43 and / or multiple reinforcing ribs 411, which is equivalent to reducing the torque at the end of the hub 41, reducing the torque gap at different positions of the hub 41, and making the fan blade 4 rotate more stably.

[0183] In some embodiments, when the motor housing 311 abuts against the reinforcing rib 411 , the motor housing 311 only abuts against a portion of the structure of the reinforcing rib 411 .

[0184] In some embodiments, the length of the motor assembly 3 inserted into the assembly seat 2 is greater than the length of the motor assembly 3 inserted into the fan blade 4 .

[0185] The length of the motor assembly 3 inserted into the assembly seat 2 is greater than the length of the motor assembly 3 inserted into the fan blade 4. This structure keeps the axial length of the fan blade 4 within the optimal range. The speed of the fan blade 4 under the same output environment is maximized, making the rotation of the fan blade 4 more stable and less noisy.

[0186] In some embodiments, the outer diameter of the mounting seat 2 is the same as the maximum outer diameter of the hub 41 of the fan blade 4. The maximum outer diameter of the hub 41 is usually located at the end of the hub 41 close to the connecting tube 21. The outer diameter of the mounting seat 2 is the same as the maximum outer diameter of the hub 41, which can minimize the wind resistance coefficient inside the fan housing 1 and improve the air outlet efficiency of the fan assembly.

[0187] It should be noted that any implementation in this embodiment can be implemented independently or in combination with one or more other implementations. When implemented in combination, the combination method should not be limited to the combination methods listed in this embodiment.

[0188] Example 2

[0189] A blowing device comprises the fan assembly in embodiment 1, wherein the fan assembly serves as a core module assembly for assembling the blowing device.

[0190] It should be pointed out that the blowing device in this embodiment includes (but is not limited to): bladeless fans, desktop fans, floor fans, spherical fans, neck fans, handheld fans, industrial fans, air conditioners, hair dryers and other products that need to promote air circulation.

[0191] The fan assembly in Example 1 is assembled inside the housing of the above product.

[0192] The fan blades of the fan assembly of the blowing device in this embodiment rotate under the drive of the motor assembly, and the rotation of the fan blades further promotes the airflow in the fan housing to move in a directional manner. The airflow belongs to a fluid, and the unique flow characteristics of the fluid will cause the airflow to flow to any airflow channel connected to the external environment. Under the action of wind pressure, the airflow enters the interior of the motor assembly along the air inlet opening of the motor assembly, and flows out from the interior of the motor assembly through the internal assembly gap and the first air outlet. The above-mentioned flow of the airflow will take away the heat generated by the operation of the motor assembly, cool down the motor assembly, and play a role in air cooling. Since the first heat dissipation path cools down the interior of the motor assembly, under the condition of equal air volume, since the temperature inside the motor assembly is higher, more heat is taken away by air cooling, and the heat dissipation effect is more obvious.

[0193] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A fan assembly, characterized in that: include: Fan housing; An assembly seat, the assembly seat is arranged in the fan housing, and the assembly seat is connected to the fan housing through a plurality of stationary blades; a motor assembly, the motor assembly being assembled in the fan housing; A fan blade connected to the motor assembly; The motor assembly is provided with an air inlet opening connecting the interior of the fan housing and the interior of the motor assembly. The interior of the motor assembly is provided with an internal assembly gap for air flow. The assembly seat is provided with a first air outlet hole. The air inlet opening, the internal assembly gap and the first air outlet hole constitute a first heat dissipation passage.

2. The fan assembly according to claim 1, characterized in that: The motor assembly comprises: a motor stator and a motor rotor, wherein the motor stator is connected to the assembly seat, the motor rotor is sleeved on the motor stator, one end of the motor rotor is inserted into the assembly seat, the air inlet opening is arranged on the motor rotor, a coil gap is provided between the motor stators, and the air inlet opening, the coil gap and the first air outlet constitute the first heat dissipation path; and / or, The plurality of stationary blades are formed with guide serrations at one end facing the fan blade; and / or, The assembly seat is provided with a hollow tube, the motor assembly is connected to the hollow tube, a first bearing and a support member are provided in the hollow tube, one end of the rotating shaft of the motor assembly is inserted into and passes through the support member and the first bearing in sequence, the other end of the rotating shaft extends out of the hollow tube, the fan blades are connected to the end of the rotating shaft extending out of the hollow tube, a first elastic member is compressed and arranged between the first bearing and the support member, one end of the first elastic member is connected to the support member, and the other end of the first elastic member is connected to the first inner ring or the first outer ring of the first bearing.

3. The fan assembly according to claim 2, characterized in that: A coupling gap is provided between the motor stator and the motor rotor, and the coupling gap is communicated with the coil gap; and / or, The motor rotor comprises: a magnetic ring and a motor housing, wherein the magnetic ring is sleeved on the motor stator, the motor housing is sleeved on the magnetic ring, one end of the motor housing is inserted into the assembly seat, and the air inlet opening is provided at one end of the motor housing facing the fan blades; and / or, The motor assembly further includes: a rotating shaft, one end of the rotating shaft is connected to the assembly seat, the other end of the rotating shaft is connected to the fan blade, the motor rotor is connected to the rotating shaft, one end of the motor rotor facing the fan blade is inserted into the fan blade, a first assembly gap is provided between the fan blade and the motor rotor, the first assembly gap, the air inlet opening, the coil gap and the first air outlet constitute a first heat dissipation path; and / or, The fan assembly further includes: a PCB circuit board, the PCB circuit board is connected to an end of the mounting seat facing away from the fan blades, a second air outlet is provided on the PCB circuit board and / or the mounting seat, and the first air outlet is connected to the second air outlet; and / or, Each of the plurality of stationary blades is bent and extended along the inner surface of the fan housing, and the plurality of moving blades are bent and extended along the hub surface of the fan blades, and the bending direction of the plurality of stationary blades is opposite to the rotation direction of the plurality of moving blades; and / or, The tooth marks of the guide saw teeth are arranged obliquely; and / or, The tooth marks of the trailing edge saw teeth are arranged obliquely; and / or, The ratio of the length of the stationary blade to the length of the moving blade is 1.1-2.8; and / or, The ratio of the number of the stationary blades to the number of the moving blades is 0.5-1; and / or, The fan assembly further includes: a second bearing, the first bearing and the second bearing are respectively arranged at two ends of the hollow tube, the support member is arranged between the first bearing and the second bearing, and one end of the rotating shaft is inserted into and passes through the second bearing, the support member and the first bearing in sequence; and / or, A second elastic member is compressed and arranged between the support member and the second bearing, one end of the second elastic member is connected to the first supporting end of the support member, and the other end of the second elastic member is connected to the second inner ring and the second outer ring of the second bearing; or, A second elastic member is compressed and arranged between the second bearing and the motor housing of the motor assembly, one end of the second elastic member is connected to the motor housing, and the other end of the second elastic member abuts against the second bearing; and / or, The thickness of the first supporting end of the supporting member gradually decreases along the direction from the second supporting end to the first supporting end; and / or, The support member is interference fit with the hollow tube.

4. The fan assembly according to claim 3, characterized in that: The end of the assembly seat connected to the PCB circuit board is provided with a plurality of connection baffles, and there is a baffle gap between adjacent connection baffles among the plurality of connection baffles, the PCB circuit board cover is arranged on the plurality of connection baffles, and the PCB circuit board and the baffle gap enclose to form the second air outlet; and / or, The tooth marks of the guide saw teeth are in the same inclination direction as the tooth marks of the trailing edge saw teeth; or, The tooth marks of the guide saw teeth are inclined in opposite directions to the tooth marks of the trailing edge saw teeth; and / or, The first supporting end of the supporting member abuts against the second inner ring or the second outer ring of the second bearing, and the second supporting end of the supporting member is connected to the first elastic member; and / or, The support member is provided with a first deformation notch at the second support end; and / or, The support member is provided with a second deformation notch at the second support end; and / or, The outer surface of the support member is raised to form convex ridges.

5. The fan assembly according to claim 4, characterized in that: The tooth marks of the guide saw teeth are inclined toward the fan housing, and the tooth marks of the trailing edge saw teeth are inclined toward the fan housing; or, The tooth marks of the guide saw teeth are inclined toward the fan housing, and the tooth marks of the trailing edge saw teeth are inclined toward the assembly seat; or, The tooth marks of the guide serrations are inclined toward the assembly seat, and the tooth marks of the trailing edge serrations are inclined toward the fan housing; and / or, The first deformation notch and the second deformation notch are arranged opposite to each other; and / or, The protrusion height of the ridge gradually decreases along the direction from the second support end to the first support end; and / or, One end of the convex ridge facing the first supporting end smoothly transitions to the surface of the supporting member.

6. The fan assembly according to claim 2, characterized in that: The tooth marks of the guide saw teeth correspond to the tooth marks of the trailing edge saw teeth; or, The tooth marks of the guide saw teeth and the tooth marks of the trailing edge saw teeth are staggered and matched with each other.

7. The fan assembly according to claim 1, characterized in that One end of the motor assembly is inserted into the assembly seat and connected to the assembly seat, and the other end of the motor assembly is inserted into the fan blade and connected to the fan blade.

8. The fan assembly according to claim 7, characterized in that A connecting shaft column and a plurality of reinforcing ribs are arranged in the fan blade, the plurality of reinforcing ribs are arranged around the connecting shaft column, the motor assembly abuts against the connecting shaft column and / or the plurality of reinforcing ribs to reduce the rotational torque of the fan blade; and / or, The motor assembly is a three-phase motor; and / or, The motor assembly is powered by a battery.

9. The fan assembly according to claim 8, characterized in that: The length of the motor assembly inserted into the assembly seat is greater than the length of the motor assembly inserted into the fan blade; and / or, The outer diameter of the mounting seat is the same as the maximum outer diameter of the hub of the fan blade; and / or, The rated operating voltage of the motor assembly is 6-8.4V or 9-12.6V; and / or, The rated operating current of the motor assembly is 0.1-2.9A or 0.08-2.7A; and / or, The rated power of the motor assembly is 0.6-25W or 0.7-33W; and / or, The rotation speed of the motor assembly is 14000-48000 rpm.

10. A blowing device, characterized in that: The blowing device is assembled with a fan assembly as described in any one of claims 1-9.

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