Portable fan

Abstract

The utility model discloses a portable fan. The portable fan comprises a fan shell; one end of the assembling seat is connected with the fan shell, the other end of the assembling seat is suspended in the fan shell, and a hollow pipe is arranged at the end part of the suspended end of the assembling seat; the fan motor is connected with the hollow pipe; the fan blades are arranged on the fan motor in a sleeving manner and are in clearance fit with the fan motor; one end of the rotating shaft is inserted into the hollow pipe and is rotationally connected with the hollow pipe, and the other end of the rotating shaft is connected with a connecting column of the fan blades; the connecting position of the hollow pipe and the rotating shaft is coated with an oil layer, and the end, connected with the rotating shaft, of the connecting column is inserted into the hollow pipe and is in clearance fit with the hollow pipe. By means of the design, the connecting column forms an effective physical barrier for the outlet of the hollow pipe, and the possibility that grease in the hollow pipe leaks outwards can be obviously reduced or even blocked.

Description

Technical Field

[0001] This application relates to the field of fans, and more particularly to a portable fan. Background Technology

[0002] In the hot summer, fans have become an essential item for people to relieve the heat. With people's demand for convenient use, lighter and more portable fans are becoming increasingly popular.

[0003] In existing technologies, portable fans typically use an external rotor motor as their power source. An external rotor motor is a common type of electric motor structure, characterized by the rotor located outside the stator, while the stator is fixed inside the casing. Due to its high power density and compact design, the external rotor motor is well-suited as a drive motor for portable fans.

[0004] The inventors of this invention discovered during their research that the shaft of an external rotor motor typically requires a certain amount of oil (such as lubricating oil or grease) to ensure the motor's lubrication performance and heat dissipation efficiency. However, when the motor rotates at high speed, due to centrifugal force, this oil is easily thrown out, leading to a series of technical problems and safety hazards. Utility Model Content

[0005] The purpose of this application is to provide a portable fan that can reduce oil leakage from the fan motor.

[0006] This application provides a portable fan, including:

[0007] Fan housing;

[0008] The mounting base has one end connected to the fan housing and the other end suspended inside the fan housing. A hollow tube is provided at the suspended end of the mounting base.

[0009] A fan motor, which is connected to the hollow tube;

[0010] Fan blades, which are sleeved on the fan motor and have a clearance fit with the fan motor;

[0011] A rotating shaft, one end of which is inserted into the hollow tube and rotatably connected to the hollow tube, and the other end of which is connected to the connecting post of the fan blade;

[0012] The hollow tube is coated with an oil layer at the connection point with the rotating shaft, and one end of the connecting post connected to the rotating shaft is inserted into the hollow tube and fits the hollow tube with a clearance.

[0013] Optionally, a bushing is provided inside the hollow tube, one end of the rotating shaft is inserted into the hollow tube and extends out of the bushing, a retaining spring is provided at the end of the rotating shaft extending out of the bushing, and an oil layer is coated between the bushing and the rotating shaft.

[0014] Optionally, a first sealing ring is provided between the retaining ring and the bushing, and the first sealing ring is sleeved on the rotating shaft; and / or,

[0015] A second sealing ring is provided between the connecting column and the bushing, and the second sealing ring is sleeved on the rotating shaft.

[0016] Optionally, the hollow tube has an inclined surface at one end facing the fan blade, and the inclined surface is connected to the inner surface of the hollow tube and the first end face of the hollow tube facing the fan blade.

[0017] Optionally, the length of the connecting shaft extending into the hollow tube is greater than the projected length of the inclined surface in the axial direction of the rotating shaft.

[0018] Optionally, the fan motor includes: an iron core, the iron core being sleeved on the hollow tube, and the fan blades being sleeved on the iron core and having a clearance fit with the iron core.

[0019] Optionally, the portable fan further includes a PCB circuit board disposed between the mounting base and the iron core, and the PCB circuit board is sleeved on the hollow tube.

[0020] Optionally, the fan motor further includes a coil disposed on the iron core, and the PCB circuit board is electrically connected to the coil or the iron core via a support pin, wherein the stiffness of the support pin is greater than the stiffness of the coil wire.

[0021] Optionally, the end of the iron core facing the fan blade is provided with an annular notch, which creates a gap between part of the iron core structure and the hollow tube.

[0022] Optionally, a magnetic ring is provided inside the hub of the fan blades. The magnetic ring is sleeved on the fan motor and is clearance-fitted with the fan motor. The axis of the magnetic ring coincides with the axis of the rotating shaft.

[0023] The beneficial effects of this embodiment are as follows: After the connecting post of the fan blade is connected to the shaft, one end of it is inserted into the hollow tube and forms a clearance fit with the hollow tube. This design makes the connecting post an effective physical barrier to the outlet of the hollow tube, which can significantly reduce or even block the possibility of grease leakage from the hollow tube. At the same time, the connecting post is inserted into the hollow tube and forms a clearance fit with it. This design makes the hollow tube have a radial limiting effect on the connecting post, which can effectively limit the radial displacement of the connecting post during rotation. This avoids serious eccentric movement of the fan blade when rotating at high speed and improves the stability of the fan blade rotation. Finally, since the radial movement of the connecting post is effectively limited, the frictional loss between the shaft and the hollow tube is reduced, thereby extending the service life of the shaft and the hollow tube. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the overall structure of a portable fan according to a specific embodiment of this application;

[0026] Figure 2 This is a cross-sectional schematic diagram of a portable fan according to a specific embodiment of this application;

[0027] Figure 3 for Figure 2 Enlarged view of region B in the middle;

[0028] Figure 4 for Figure 3 Enlarged view of region C in the middle;

[0029] Figure 5 This is a cross-sectional schematic diagram of a magnetic ring and fan blades according to a specific embodiment of this application.

[0030] Figure descriptions: 1. Fan housing; 11. Outer shell; 12. Inner shell; 2. Mounting base; 21. Connecting ring; 22. Stationary blade; 23. Base; 24. Hollow tube; 241. Inclined surface; 3. Fan motor; 31. Iron core; 311. Annular notch; 32. Coil; 4. Fan blade; 41. Connecting column; 42. Magnetic ring; 5. Shaft; 51. Annular groove; 52. Snap ring; 6. Bushing; 61. First sealing ring; 62. Second sealing ring. Detailed Implementation

[0031] To facilitate understanding of this utility model, a more detailed description is provided below with reference to 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 one or more intermediate elements may exist between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of the portable fan in this embodiment; Figure 2 This is a cross-sectional view of the portable fan in this embodiment.

[0034] like Figure 1 and Figure 2 As shown, a portable fan includes a fan housing 1; a mounting base 2, one end of which is connected to the fan housing 1, and the other end of which is suspended inside the fan housing 1, with a hollow tube 24 at the suspended end of the mounting base 2; a fan motor 3, which is connected to the hollow tube 24; fan blades 4, which are fitted onto the fan motor 3 with a clearance fit; a rotating shaft 5, one end of which is inserted into the hollow tube 24 and rotatably connected to the hollow tube 24, and the other end of which is connected to a connecting post 41 of the fan blades 4; an oil layer is coated at the connection point between the hollow tube 24 and the rotating shaft 5, and the end of the connecting post 41 connected to the rotating shaft 5 is inserted into the hollow tube 24 with a clearance fit.

[0035] In this embodiment, the fan housing 1 is a cylindrical hollow housing, with the air inlet and outlet facing each other. However, the shape of the fan housing 1 is not limited to this. Depending on the specific application scenario, in some embodiments, the shape of the fan housing 1 can be (but is not limited to): elliptical, spherical, or prismatic. In some embodiments, a handle is also fitted on the fan housing 1 for easy gripping. In some embodiments, the portable fan can be a standalone module, and the fan housing 1 is provided with an expansion interface for connecting to corresponding expansion modules.

[0036] In this embodiment, the fan includes an inner housing 12 and an outer housing 11, with the outer housing 11 fitted onto the inner housing 12. However, the structure of the fan housing 1 is not limited. Depending on the specific application scenario, in some embodiments, the structure of the fan housing 1 can be (but is not limited to): integral molding, half-shell splicing, three-shell sleeve, etc.

[0037] In this embodiment, the fan housing 1 is made of plastic, which provides advantages such as lightweight, wear resistance, and corrosion resistance. However, the material of the fan housing 1 is not limited to this. Depending on the specific application scenario, in some embodiments, the fan housing 1 can be made of metal, alloy, or other materials.

[0038] In this embodiment, the fan motor 3 can be (but is not limited to): a single-phase motor, a two-phase motor, or a three-phase motor. The fan blades 4 can be axial flow blades or diagonal flow blades.

[0039] In this embodiment, the mounting base 2 includes a connecting ring 21, a base 23, and multiple stationary blades 22. The connecting ring 21 is connected to the air outlet of the fan housing 1. One end of each of the multiple stationary blades 22 is connected to the connecting ring 21, and the other end is connected to the base 23. The empty pipe is connected to the base 23.

[0040] The hollow tube 24 can be integrally molded onto the base 23, or it can be manufactured in parts. When the hollow tube 24 is manufactured in parts, one end of the hollow tube 24 is provided with a connecting seat, which is connected to the base 23 by screws or snap-fit. In some embodiments, when the hollow tube 24 and the base 23 are manufactured in parts, the strength of the material used to make the hollow tube 24 is greater than the strength of the material used to make the base 23. For example, the hollow tube 24 is made of an alloy material, while the base 23 is made of plastic.

[0041] In this embodiment, the hollow tube 24 is connected to the rotating shaft 5 via a bushing 6 disposed inside the hollow tube 24. However, the connection method between the hollow tube 24 and the rotating shaft 5 is not limited to this. Depending on the specific application scenario, in some embodiments, a bearing is disposed inside the hollow tube 24, and the bearing is rotatably connected to the rotating shaft 5; or, a necking ring protrudes from inside the hollow tube 24, and the necking ring is rotatably connected to the rotating shaft 5.

[0042] In this embodiment, the oil layer refers to the lubricating protective layer formed by grease at the connection between the hollow tube 24 and the rotating shaft 5. The effect of the grease coating in the oil layer can be (but is not limited to): a uniform oil coating, oil clumps, etc.

[0043] In the above embodiment, after the connecting post 41 of the fan blade 4 is connected to the rotating shaft 5, one end of it is inserted into the hollow tube 24 and forms a clearance fit with the hollow tube 24. This design makes the connecting post 41 an effective physical barrier to the outlet of the hollow tube 24, which can significantly reduce or even block the possibility of grease leaking out of the hollow tube 24. At the same time, the connecting post 41 is inserted into the hollow tube 24 and forms a clearance fit with it. This design makes the hollow tube 24 have a radial limiting effect on the connecting post 41, which can effectively limit the radial displacement of the connecting post 41 during rotation. This avoids serious eccentric movement of the fan blade 4 when rotating at high speed and improves the stability of the fan blade rotation. Finally, since the radial movement of the connecting post 41 is effectively limited, the frictional loss between the rotating shaft 5 and the hollow tube 24 is reduced, thereby extending the service life of the rotating shaft 5 and the hollow tube 24.

[0044] like Figure 3 As shown, in some embodiments, a bushing 6 is provided inside the hollow tube 24, one end of the rotating shaft 5 is inserted into the hollow tube 24 and extends out of the bushing 6, a retaining ring 52 is provided at the end of the rotating shaft 5 that extends out of the bushing 6, and an oil layer is coated between the bushing 6 and the rotating shaft 5.

[0045] In this embodiment, an annular groove 51 is provided at one end of the rotating shaft 5 that protrudes from the bushing 6, and a retaining spring 52 is provided in the annular groove 51. The outer diameter of the retaining spring 52 is larger than the inner diameter of the bushing 6, so that the rotating shaft 5 will not detach from the bushing 6 under the action of external force.

[0046] The bushing 6, acting as an intermediate support, effectively disperses the contact stress between the rotating shaft 5 and the hollow tube 24, reducing localized wear and significantly improving the rotational accuracy of the rotating shaft 5 while decreasing the probability of eccentric movement. Applying oil between the bushing 6 and the rotating shaft 5 ensures that the lubricating oil is evenly distributed on their contact surfaces, further reducing dry friction.

[0047] It is important to emphasize that, in order to reduce the probability and amplitude of eccentric movement of the rotating shaft 5, a double-sleeve 6 design is typically adopted. That is, two sleeves 6 are installed inside the hollow tube 24 to increase the restriction on the radial movement tendency of the rotating shaft 5. The reason why a single-sleeve 6 design can be used in this embodiment is mainly because the relative positional and assembly relationship between the connecting column 41 and the hollow tube 24 effectively limits the radial movement of the rotating shaft 5, thus saving the material of one rotating shaft 5 while ensuring the stability of the rotation of the rotating shaft 5 and the fan blades 4.

[0048] In some embodiments, a first sealing ring 61 is provided between the snap ring 52 and the bushing 6, and the first sealing ring 61 is sleeved on the rotating shaft 5.

[0049] The first sealing ring 61 is installed between the retaining ring 52 and the bushing 6, and is fitted onto the rotating shaft 5. It effectively seals the gap between the rotating shaft 5 and the hollow tube 24, preventing internal grease from leaking out. The sealing ring prevents external dust or impurities from entering the bushing 6, keeping the internal structure clean and avoiding equipment malfunctions caused by foreign object intrusion. Since the first sealing ring 61 is typically made of elastic material, it provides a certain buffering effect between the retaining ring 52 and the bushing 6, absorbing vibration energy and reducing vibration and noise during equipment operation.

[0050] In some embodiments, a second sealing ring 62 is provided between the connecting post 41 and the bushing 6, and the second sealing ring 62 is sleeved on the rotating shaft 5.

[0051] The second sealing ring 62 is installed between the connecting column 41 and the bushing 6, and is fitted onto the rotating shaft 5. It effectively seals the gap between the rotating shaft 5 and the hollow tube 24, preventing internal grease from leaking out. The sealing ring prevents external dust or impurities from entering the bushing 6, keeping the internal structure clean and avoiding equipment malfunctions caused by foreign object intrusion. Since the second sealing ring 62 is typically made of elastic material, it provides a certain buffering effect between the connecting column 41 and the bushing 6, absorbing vibration energy and reducing vibration and noise during equipment operation.

[0052] In some embodiments, a first sealing ring 61 and a second sealing ring 62 are respectively provided at both ends of the bushing 6, which can effectively prevent grease leakage from both ends of the bushing 6. At the same time, the first sealing ring 61 and the second sealing ring 62 also serve to limit the axial movement of the rotating shaft 5, which can effectively reduce the mechanical vibration of the rotating shaft 5 in the axial direction and make the rotation of the fan blade 4 more stable.

[0053] In some embodiments, an inclined surface 241 is provided at the end of the hollow tube 24 facing the fan blade 4. The inclined surface 241 is connected to the inner surface of the hollow tube 24 and the first end face of the hollow tube 24 facing the fan blade 4. The angle between the inclined surface 241 and the horizontal line is θ, and the value of θ ranges from 15 to 75 degrees.

[0054] The design of the inclined surface 241 effectively guides the connecting post 41 along the correct path during insertion into the hollow tube 24, reducing assembly deviations and friction. The inclined surface 241 is located at the inlet of the hollow tube 24, far from the bushing 6, and the shaft 5 is relatively long at this location. During the initial rotation of the shaft 5, eccentric movement within the allowable clearance range between the connecting post 41 and the hollow tube 24 may occur at this location. Although the amplitude of this eccentric movement is small, it can still cause friction and wear between the connecting post 41 and the hollow tube 24. By placing the inclined surface 241 at this location, the gap between the hollow tube 24 and the connecting post 41 gradually increases along the direction of the shaft 5 towards the fan blade 4. This increasing gap trend matches the amplitude of the possible eccentric movement of the connecting post 41, thereby reducing the possibility of friction between the connecting post 41 and the hollow tube 24 and lowering frictional losses.

[0055] In some implementations, the inclined surface 241 can be an arc-shaped structure.

[0056] like Figure 4 As shown, in some embodiments, the length L2 of the connecting shaft extending into the hollow tube 24 is greater than the projected length L1 of the inclined surface 241 in the axial direction of the rotating shaft 5. That is, the length of the connecting shaft extending into the hollow tube 24 is sufficient to pass through the area where the inclined surface 241 is located and to insert into the area of ​​the hollow tube 24 other than the inclined surface 241.

[0057] As can be seen from the above structure, the gap between the hollow tube 24 and the connecting post 41 is initially evenly spaced along the direction from the bushing 6 to the fan blade 4, gradually increasing from the inclined surface 241. This structure provides a good limiting environment between the front end of the connecting post 41 and the hollow tube 24. The radial movement of the rotating shaft 5 does not gradually increase with the setting of the inclined surface 241, but is limited to a fixed range by the stable gap between the front end of the connecting post 41 and the hollow tube 24. At the same time, as the connecting post 41 extends towards the fan blade 4, the gap between the connecting post 41 and the hollow tube 24 increases, providing space for possible eccentric movements, minimizing friction between the hollow tube 24 and the connecting post 41, and improving the rotational stability of the fan blade 4.

[0058] In some embodiments, the fan motor 3 includes an iron core 31, which is sleeved on a hollow tube 24, and fan blades 4 are sleeved on the iron core 31 and have a clearance fit with the iron core 31. The iron core 31, sleeved on the hollow tube 24, can dissipate heat through the design of an open structure at one end of the hollow tube 24. The rotating shaft 5 and connecting column 41 rotate inside the hollow tube 24, driving the airflow inside the hollow tube 24 to flow outward, which can dissipate heat from the inside of the iron core 31, improving heat dissipation efficiency.

[0059] In some embodiments, the portable fan further includes a PCB circuit board disposed between the mounting base 2 and the iron core 31, and the PCB circuit board is sleeved on the hollow tube 24.

[0060] Placing the PCB between the mounting base 2 and the iron core 31 makes full use of the existing space and avoids additional space occupation. This design makes the entire fan structure more compact. The PCB is close to the fan motor 3 and related components, shortening the electrical connection path and reducing the possibility of signal attenuation and interference. Due to the close proximity, the wiring between the PCB and the fan motor 3 does not need to be exposed within the portable fan's airflow duct, reducing obstruction to airflow within the fan housing 1. The PCB is located in the airflow path of the fan blades 4, effectively utilizing airflow for heat dissipation. This design allows the heat generated by the circuit board to be quickly dissipated, preventing performance degradation or malfunction due to overheating.

[0061] In some embodiments, the fan motor 3 further includes a coil 32, which is disposed on the iron core 31. The PCB circuit board and the coil 32 are electrically connected through a support pin, and the stiffness of the support pin is greater than the stiffness of the wire of the coil 32.

[0062] The support pins not only serve as electrical connections but also provide mechanical support, ensuring the stability of the PCB circuit board during equipment operation and reducing vibration and noise. Since PCB circuit boards are typically thin and light, they are prone to bending or deformation under external forces. The high rigidity design of the support pins effectively supports the PCB circuit board, preventing relative movement or cracking between it and the hollow tube 24 under external forces. The rigid design of the support pins also ensures a more stable electrical connection between the PCB circuit board and the coil 32, reducing signal interference and malfunctions caused by loose connections or poor contact.

[0063] In some embodiments, an annular notch 311 is provided at the end of the iron core 31 facing the fan blade 4, and the annular notch 311 creates a gap between part of the structure of the iron core 31 and the hollow tube.

[0064] The annular notch 311 provides a direct heat dissipation channel for the airflow blown out by the fan blades 4. As the airflow passes through the annular notch 311, it can more effectively carry away the heat generated during the operation of the iron core 31, thus significantly reducing the temperature of the iron core 31. Eddy currents, caused by the alternating magnetic field inside the iron core 31, generate additional heat and reduce motor efficiency. The annular notch 311 reduces the area of ​​the inner surface of the iron core 31, thereby increasing its surface resistance and reducing the intensity of the eddy currents inside the iron core 31. Simultaneously, the annular notch 311 significantly reduces this energy loss by locally cutting off the eddy current loop. The design of the annular notch 311 reduces the amount of material used in the iron core 31, thereby reducing the overall weight and making the portable fan lighter.

[0065] Please see Figure 5 , Figure 5 This is a cross-sectional schematic diagram of the magnetic ring and fan blades in this embodiment.

[0066] like Figure 5 As shown, in some embodiments, a magnetic ring 42 is provided inside the hub of the fan blade 4. The magnetic ring 42 is sleeved on the fan motor 3 and is in clearance fit with the fan motor 3. The axis S2 of the magnetic ring 42 coincides with the axis S1 of the rotating shaft 5.

[0067] In this embodiment, the magnetic ring 42 is a ring structure made of magnetic material. However, the structure of the magnetic ring 42 is not limited to this. Depending on the specific application scenario, in some embodiments, the magnetic ring 42 can be formed by multiple mutually spaced strip magnetic strips to form a ring structure.

[0068] In this embodiment, the magnetic ring 42 serves as the power source for the rotation of the fan blades 4, while the rotating shaft 5 is a connecting component that keeps the fan blades 4 in a stable position. The axes of both coincide, ensuring that the fan blades 4 rotate around the same axis, making the rotation of the fan blades 4 smoother and more efficient.

[0069] It should be noted that any of the embodiments in this example can be implemented independently or in combination with one or more other embodiments. When implementing in combination, the combination method should not be limited to the combination methods listed in this example.

[0070] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A portable fan, characterized in that, include: Fan housing; The mounting base has one end connected to the fan housing and the other end suspended inside the fan housing. A hollow tube is provided at the suspended end of the mounting base. A fan motor, which is connected to the hollow tube; Fan blades, which are sleeved on the fan motor and have a clearance fit with the fan motor; A rotating shaft, one end of which is inserted into the hollow tube and rotatably connected to the hollow tube, and the other end of which is connected to the connecting post of the fan blade; The hollow tube is coated with an oil layer at the connection point with the rotating shaft, and one end of the connecting post connected to the rotating shaft is inserted into the hollow tube and fits the hollow tube with a clearance.

2. The portable fan according to claim 1, characterized in that, A bushing is provided inside the hollow tube. One end of the rotating shaft is inserted into the hollow tube and extends out of the bushing. A retaining spring is provided at the end of the rotating shaft that extends out of the bushing. An oil layer is coated between the bushing and the rotating shaft.

3. The portable fan according to claim 2, characterized in that, A first sealing ring is provided between the retaining ring and the bushing, and the first sealing ring is sleeved on the rotating shaft; and / or A second sealing ring is provided between the connecting column and the bushing, and the second sealing ring is sleeved on the rotating shaft.

4. The portable fan according to claim 1, characterized in that, The hollow tube has an inclined surface at one end facing the fan blade, and the inclined surface is connected to the inner surface of the hollow tube and the first end face of the hollow tube facing the fan blade.

5. The portable fan according to claim 4, characterized in that, The length of the connecting shaft extending into the hollow tube is greater than the projected length of the inclined surface in the axial direction of the rotating shaft.

6. The portable fan according to claim 1, characterized in that, The fan motor includes: an iron core, which is sleeved on the hollow tube, and fan blades are sleeved on the iron core and have a clearance fit with the iron core.

7. The portable fan according to claim 6, characterized in that, The portable fan also includes a PCB circuit board, which is disposed between the mounting base and the iron core, and is sleeved on the hollow tube.

8. The portable fan according to claim 7, characterized in that, The fan motor further includes a coil, which is disposed on the iron core. The PCB circuit board is electrically connected to the coil or the iron core through a support pin, and the stiffness of the support pin is greater than the stiffness of the coil wire.

9. The portable fan according to claim 6, characterized in that, The iron core has an annular notch at one end facing the fan blade, which creates a gap between part of the iron core structure and the hollow tube.

10. The portable fan according to claim 1, characterized in that, A magnetic ring is provided inside the hub of the fan blades. The magnetic ring is sleeved on the fan motor and is in clearance fit with the fan motor. The axis of the magnetic ring coincides with the axis of the rotating shaft.

Images