Heat dissipation fan and electronic device

Abstract

The application provides a heat dissipation fan and an electronic device. The heat dissipation fan comprises a base, a hollow rotating shaft and a supporting column. The base is used for being installed in the electronic device. The hollow rotating shaft is rotationally connected with the base. The hollow rotating shaft is provided with a fan blade. The hollow rotating shaft can rotate relative to the base to drive the fan blade to rotate. The supporting column is arranged in the hollow region of the hollow rotating shaft. One end of the supporting column is connected with the base. The end of the supporting column, which is away from the base, is provided with a limiting part. The side of the limiting part, which is away from the base, is used for abutting against the shell of the electronic device. In the radial direction of the supporting column, the size of the side of the limiting part, which is away from the base, is greater than the diameter of the hollow rotating shaft. The size of the side of the limiting part, which is away from the base, is set to be greater than the diameter of the hollow rotating shaft. The contact area of the limiting part and the shell can be increased. The supporting effect on the shell of the electronic device is improved. The bending deformation degree of the shell under pressure is reduced. The possibility of emitting sharp abnormal sound or stopping rotating of the heat dissipation fan is reduced.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology, and in particular to a cooling fan and electronic device. Background Technology

[0002] In existing electronic device (such as tablet computer) structural designs, air cooling is often used to reduce the internal temperature of the tablet to meet the high-performance requirements of the electronic device. The cooling fan for air cooling is usually installed between the electronic device's casing and screen. The rotating blades of the cooling fan generate heat convection, thereby carrying heat away from the electronic device. However, when the electronic device is subjected to pressure, the casing is prone to deformation, resulting in a high risk of compression between the casing and the rotating structure of the cooling fan. Utility Model Content

[0003] This application provides a cooling fan and an electronic device that can reduce the risk of compression between the housing and the rotating structure of the cooling fan.

[0004] Firstly, a cooling fan is provided, comprising: Base, the base being used for mounting within an electronic device; A hollow rotating shaft is rotatably connected to the base, and a fan blade is mounted on the hollow rotating shaft. The hollow rotating shaft can rotate relative to the base to drive the fan blade to rotate. A support column is disposed within the hollow region of the hollow rotating shaft. One end of the support column is connected to the base. A limiting part is provided at the end of the support column facing away from the base. The side of the limiting part facing away from the base is used to abut against the housing of the electronic device. Along the radial direction of the support column, the dimension of the side of the limiting part facing away from the base is larger than the diameter of the hollow rotating shaft.

[0005] The cooling fan provided in this application embodiment has a side dimension of the limiting part away from the base that is larger than the diameter of the hollow rotating shaft. This increases the contact area between the limiting part and the housing, improves the support effect on the housing of the electronic device, and reduces the degree of bending deformation of the housing under pressure. In this way, the problem of the housing easily coming into contact with the rotating structure of the cooling fan under pressure can be solved from the root, thereby reducing the possibility of the cooling fan emitting sharp abnormal noise or stopping. Even if the distance between the housing and the rotating structure of the cooling fan (such as fan blades, motor housing, etc.) is small, the housing is still not easy to come into contact with the rotating structure of the cooling fan under pressure because the bending deformation of the housing is small. Conversely, the effective support of the limiting part of the cooling fan for the housing can reduce the bending deformation of the housing under pressure, thus appropriately reducing the distance between the housing and the rotating structure of the cooling fan. This helps to reduce the thickness of the electronic device and realize the lightweight design of the electronic device.

[0006] In one possible implementation, the outer side of the support column and the inner side of the hollow rotating shaft are spaced apart.

[0007] Understandably, when the cooling fan is operating, the hollow shaft will rotate relative to the support column, and the outer side of the support column and the inner side of the hollow shaft are spaced apart, so that the hollow shaft and the support column will not make direct contact. This can reduce or even eliminate wear between the support column and the hollow shaft, which helps to extend the service life of the cooling fan.

[0008] The cooling fan also includes a second bearing, which is sleeved on the outer circumference of the hollow shaft and coaxially arranged with the support column. The second bearing is fixedly connected to the base, and there is a clearance fit between the second bearing and the hollow shaft. For example, the outer ring of the second bearing can be fixedly connected to the base, and the inner ring of the second bearing can be clearance-fitted with the hollow shaft. When the central axis of the hollow shaft deviates to the point that the outer surface of the hollow shaft contacts the second bearing, the inner surface of the hollow shaft remains spaced from the outer surface of the support column.

[0009] In some embodiments, a lubricant (such as lubricating oil) may be added between the hollow shaft and the support column to reduce the possibility of friction between the support column and the hollow shaft. An annular first oil seal may be provided between the support column and the hollow shaft to reduce lubricant leakage.

[0010] In some embodiments, a lubricant (such as lubricating oil) may be added between the hollow shaft and the base to reduce the possibility of friction between the hollow shaft and the base. An annular second oil seal may be provided between the hollow shaft and the base to reduce lubricant leakage.

[0011] In some embodiments, wear-resistant plates can also be provided between the hollow shaft and the base, which can reduce mutual wear between the hollow shaft and the base and help to improve the service life of the cooling fan.

[0012] In one possible implementation, the cooling fan further includes a first bearing, which is disposed around the central axis of the support column and located between the support column and the hollow rotating shaft.

[0013] Installing the first bearing between the support column and the hollow shaft can reduce the possibility of relative friction between the support column and the hollow shaft, thus extending the lifespan of the cooling fan.

[0014] In one possible implementation, the first bearing is fixedly connected to the support column, and the first bearing is clearance-fitted with the hollow rotating shaft; Alternatively, the first bearing may be clearance-fitted with the support column, or the first bearing may be fixedly connected to the hollow rotating shaft.

[0015] By fixing the first bearing to the support column and making a clearance fit between the first bearing and the hollow shaft, the assembly difficulty of the first bearing, support column, and hollow shaft can be reduced, which helps to improve the assembly efficiency of the cooling fan.

[0016] In some embodiments, a lubricant (such as lubricating oil) may be added between the first bearing and the hollow shaft.

[0017] By fitting the first bearing with the support column with a clearance and fixing the first bearing to the hollow shaft, the assembly difficulty of the first bearing, support column, and hollow shaft can be reduced, thus helping to improve the assembly efficiency of the cooling fan.

[0018] In some embodiments, a lubricant (such as lubricating oil) may be added between the first bearing and the support column.

[0019] In some embodiments, the first bearing may be a type of bearing such as a tapered roller bearing, a deep groove ball bearing, a cylindrical roller bearing, a crossed roller bearing, a needle roller bearing, an angular contact ball bearing, or a magnetic bearing. This application does not impose any limitations on the embodiments described herein.

[0020] In some embodiments, the second bearing may be a type of bearing such as a tapered roller bearing, a deep groove ball bearing, a cylindrical roller bearing, a crossed roller bearing, a needle roller bearing, an angular contact ball bearing, or a magnetic bearing. This application does not impose any limitations on the embodiments described herein.

[0021] In one possible implementation, the cooling fan further includes a second bearing, which is sleeved on the outer periphery of the hollow rotating shaft and coaxially arranged with the support column. The second bearing is fixedly connected to the base, and there is a clearance fit between the second bearing and the hollow rotating shaft. When a portion of the outer surface of the hollow shaft contacts the second bearing, the first bearing contacts both the hollow shaft and the support column. When the outer surface of the hollow shaft is separated from the second bearing, the first bearing is separated from the corresponding hollow shaft or the support column.

[0022] When a portion of the outer side of the hollow shaft contacts the second bearing, the first bearing contacts the hollow shaft and the support column. The outer and inner sides of the hollow shaft can simultaneously contact the second and first bearings, thereby distributing the force, reducing the load on the second bearing under high load conditions, reducing eccentric wear, and helping to enhance the overall rigidity of the cooling fan.

[0023] When a portion of the outer side of the hollow shaft contacts the second bearing, the first bearing contacts the hollow shaft and the support column. The outer and inner sides of the hollow shaft can simultaneously contact the second and first bearings, thus distributing the force. This can also reduce the load on the second bearing under high load conditions, reduce eccentric wear, and help enhance the overall rigidity of the cooling fan.

[0024] In one possible implementation, the first bearing is fixedly connected to both the support column and the hollow rotating shaft.

[0025] By fixing the first bearing to the support column and the hollow shaft respectively, the force on the support column and the hollow shaft can be balanced, reducing eccentric wear and extending the service life of the cooling fan.

[0026] Furthermore, since the first bearing is fixedly connected to the support column and the hollow shaft respectively, the hollow shaft will have less movement deviating from the central axis of the support column when it rotates, and the possibility of friction between the outer surface of the hollow shaft and the base is small. Therefore, the cooling fan does not need to be equipped with a second bearing. This reduces the number of parts required for the cooling fan and helps to simplify the structure of the cooling fan.

[0027] In some embodiments of this application, the first connecting portion of the first bearing is fixedly connected to the support column, and the second connecting portion of the first bearing is clearance-fitted with the hollow shaft. The cooling fan is also provided with a second bearing, the outer ring of the second shaft is fixed to the base, and the inner ring of the second shaft is clearance-fitted with the hollow shaft. In other cases, the first connecting portion of the first bearing is fixedly connected to the support column, and the second connecting portion of the first bearing is fixedly connected to the hollow shaft. The cooling fan may not have a second bearing, and a gap may be provided between the outer surface of the hollow shaft and the base to reduce friction.

[0028] In one possible implementation, the first bearing is a crossed roller bearing.

[0029] Crossed roller bearings arrange rollers in two different directions in a cross pattern. Under the same load capacity, the radial dimension of crossed roller bearings is smaller than that of traditional bearings, allowing for a more compact cooling fan structure. Without changing the overall dimensions of the cooling fan, the size of the hollow shaft can be reduced, thus increasing the size of the fan blades. Furthermore, crossed roller bearings have high rigidity and precision, enabling them to be used in high-load environments, and they rotate smoothly with minimal error during operation.

[0030] In one possible implementation, the support column extends through the first bearing.

[0031] By having the support column pass through the first bearing, the customization difficulty of applying the first bearing to the cooling fan can be reduced, and the complexity of component design can be reduced, which helps to reduce the cost of the cooling fan.

[0032] In one possible implementation, the first bearing is disposed between the support column and the base. The first bearing includes a first connecting portion and a second connecting portion rotatably disposed on the outer periphery of the first connecting portion. The second connecting portion is capable of contacting the hollow rotating shaft. The two ends of the first connecting portion are respectively fixedly connected to the base and the support column.

[0033] In this embodiment, when the hollow shaft rotates away from the central axis of the support column, the second connecting part will be squeezed against the first connecting part in the radial direction of the support column. Since the support column is not directly connected to the base, there will be no shear force between the support column and the base due to the squeezing of the first connecting part. In this way, the wear on the support column can be reduced.

[0034] In some embodiments, the first connection part can be made of a material with good rigidity and wear resistance, which helps to improve the overall rigidity of the cooling fan and helps to control the manufacturing cost of the cooling fan.

[0035] In one possible implementation, the cooling fan includes a first cover plate, the base is connected to the first cover plate, a baffle is provided on the edge of one side of the first cover plate, the hollow rotating shaft and the support column are both provided in the enclosed area of ​​the baffle and the first cover plate, and a sealing element is provided on the side of the baffle away from the first cover plate, the sealing element is used to abut against the side of the housing to seal the gap between the baffle and the housing.

[0036] A sealing element is installed on the side of the enclosure away from the first cover plate. When the cooling fan is installed in the housing of the electronic device, the sealing element can seal the gap between the enclosure and the housing, so that the air blown out by the cooling fan can flow in a direction and improve the heat dissipation capacity of the electronic device.

[0037] In some embodiments, the seal may be foam, sealing strips, etc.

[0038] In other embodiments, the cooling fan includes a first cover plate and a second cover plate spaced apart. A baffle is provided on the edge of the first cover plate facing the second cover plate. The side of the baffle away from the first cover plate is connected to the second cover plate. A hollow rotating shaft and a support column are both provided in the enclosed area of ​​the first cover plate, the second cover plate and the baffle. The side of the second cover plate away from the first cover plate is used to abut against the housing.

[0039] A second cover plate is provided on one side of the first cover plate. The side of the second cover plate facing away from the first cover plate is used to abut against the housing of the electronic device. The second cover plate can provide support for the housing, thereby reducing the deformation of the housing.

[0040] The overall thickness of a cooling fan without a second cover plate can be less than that of a cooling fan with a second cover plate. Of course, in other embodiments, the cooling fan without a second cover plate can utilize the space created after removing the second cover plate to appropriately increase the size of the fan blades and improve the cooling capacity of the cooling fan.

[0041] In a second aspect, an electronic device is provided, including a housing and the aforementioned cooling fan, wherein a limiting portion of the cooling fan abuts against the side of the housing.

[0042] Optionally, the electronic device may also include a display screen, with a cooling fan located between the housing and the display screen.

[0043] Because the cooling fan in any of the above embodiments provides good support for the housing of the electronic device, it can reduce the degree of bending deformation of the housing under pressure. Therefore, the housing of the electronic device containing this cooling fan is less likely to bend under pressure, and the housing is less likely to come into contact with the rotating structure of the cooling fan. This reduces the possibility of the electronic device making a sharp noise or stopping under pressure, resulting in high reliability. In addition, because the housing is less likely to bend under pressure, the housing is still less likely to come into contact with the rotating structure of the cooling fan after being compressed. This allows for a reduction in the distance between the housing and the rotating structure of the cooling fan, which helps to reduce the thickness of the electronic device and achieve a thinner and lighter design. Attached Figure Description

[0044] Figure 1 A cross-sectional structural diagram of a cooling fan provided for related technologies.

[0045] Figure 2 for Figure 1 The diagram shows a partial cross-sectional view of a cooling fan installed in an electronic device.

[0046] Figure 3 for Figure 2 The diagram shows a partial cross-sectional view of the cooling fan installed in an electronic device under pressure.

[0047] Figure 4 This is a schematic diagram of the cooling fan and housing provided in one embodiment of this application.

[0048] Figure 5 for Figure 4 The diagram shows another view of the cooling fan and housing.

[0049] Figure 6 for Figure 4 The diagram shows a cross-sectional view of the cooling fan.

[0050] Figure 7 This is a schematic diagram of the cross-sectional shape of the limiting part provided in an embodiment of this application.

[0051] Figure 8 This is a cross-sectional view of the second bearing, hollow shaft, and support column after assembly, as provided in an embodiment of this application.

[0052] Figure 9 This is a cross-sectional view of the cooling fan and housing provided in another embodiment of this application.

[0053] Figure 10 This is a cross-sectional view of the cooling fan and housing provided in another embodiment of this application.

[0054] Figure 11 This is a cross-sectional view of a cooling fan and housing provided in another embodiment of this application.

[0055] Figure 12 This is a cross-sectional view of the first bearing, second bearing, hollow shaft, and support column after assembly, according to an embodiment of this application.

[0056] Figure 13 This is an exploded view of the structure of a first bearing provided in an embodiment of this application.

[0057] Figure 14 This is a cross-sectional view of the first bearing, second bearing, hollow shaft, and support column after assembly, according to another embodiment of this application.

[0058] Figure 15 This is an exploded view of the structure of a first bearing provided in yet another embodiment of this application.

[0059] Figure 16 This is a cross-sectional view of a cooling fan and housing provided in another embodiment of this application.

[0060] Figure 17 for Figure 16 The diagram shows the structure of the cooling fan.

[0061] Figure 18 This is a schematic diagram of the structure of a cooling fan provided in one embodiment of this application.

[0062] Figure label: 1' Housing; 2' Cooling fan; 21' Base; 22' Shaft; 23' Fan blade; 3' Screen; 1. Housing; 101. Ventilation holes; 2. Cooling fan; 201. Base; 202. Hollow shaft; 203. Support column; 2031. Limiting part; 204. Stator coil; 205. Rotor magnet; 206. Motor housing; 207. First cover plate; 208. Second cover plate; 209. Enclosure; 210. Seal; 211. Fan blade; 212. First oil seal cover; 213. Second oil seal cover; 214. Wear-resistant sheet; 215. First bearing; 2151. First connecting part; 2152. Second connecting part; 2153. Roller; 2154. Cage; 216. Second bearing. Detailed Implementation

[0063] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc., indicate the orientation or positional relationship based on the installation orientation or positional relationship, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0066] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0067] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0068] With the rapid development of information technology, the performance of electronic devices, represented by tablet computers, is constantly improving. Core components such as processors and graphics processors generate a large amount of heat during operation. To ensure the stable operation of electronic devices and meet their high-performance requirements, air cooling technology is widely used in electronic device heat dissipation systems. The core principle of air cooling is to place a cooling fan inside the electronic device. The rotation of the fan blades forces airflow, creating thermal convection, thereby efficiently carrying the heat from inside the electronic device to the outside.

[0069] Figure 1 A cross-sectional view of a cooling fan 2' provided for related technologies; Figure 2 for Figure 1 The diagram shows a partial cross-sectional view of the cooling fan 2' installed in an electronic device; Figure 3 for Figure 2 The diagram shows a partial cross-sectional view of the cooling fan 2' installed in an electronic device under pressure.

[0070] Reference Figure 1 and Figure 2 In the structural design of tablet computers in related technologies, the cooling fan 2' is typically installed between the casing 1' and the screen 3' of the electronic device. The overall thickness t of the electronic device consists of multiple parts, namely t = screen thickness a + assembly gap b + cooling fan thickness c + anti-pinch gap d + casing thickness e, where the anti-pinch gap d is the gap between the side of the cooling fan 2' facing the casing 1' and the casing 1'. (Refer to...) Figure 3 The purpose of the anti-pinch gap d is primarily to effectively reduce the likelihood of direct contact between the housing 1' and the rotating structure (such as the fan blades 23', motor housing, etc.) of the cooling fan 2' when the housing 1' is subjected to external pressure and undergoes bending deformation. If the anti-pinch gap d is too small, the inner surface of the housing 1' can easily come into contact with the rotating structure of the cooling fan 2' under external pressure. Once a large compressive force is generated between the two, it will cause the cooling fan 2' to emit a sharp abnormal noise. In more serious cases, the fan blades 23' of the cooling fan 2' may stop rotating, which will cause the internal temperature of the electronic device to rise sharply, seriously affecting the performance and service life of the electronic device.

[0071] With the trend towards thinner and smaller electronic devices, reducing the overall thickness has become a key design objective. From the perspective of overall thickness composition, this can be achieved by reducing the thickness e of the casing 1' and the anti-extrusion gap d. However, simply thinning the thickness e of the casing 1' weakens its strength, making it more prone to bending and deformation under external forces. After bending and deformation, the casing 1' is more likely to be squeezed against the rotating structure of the cooling fan 2'.

[0072] Based on this, the present application provides a cooling fan and an electronic device. By improving the structure of the cooling fan, a limiting part is provided at one end of the support column away from the base. The size of the side of the limiting part of the support column away from the base is set to be larger than the diameter of the hollow rotating shaft, which can increase the contact area between the limiting part and the housing, so that the cooling fan can effectively support the housing of the electronic device.

[0073] This application first provides an electronic device, which may be, for example, a mobile phone, tablet computer, laptop computer, television set, in-vehicle device, wearable device, personal digital assistant (PDA), point of sale (POS) terminal, video surveillance equipment, etc. The mobile phone may be, for example, a conventional candybar phone or a foldable phone, such as a small vertical folding phone, a horizontally folding phone, or a horizontally folding phone. Wearable devices may be, for example, smart bracelets, smartwatches, wireless headphones, augmented reality (AR) glasses, AR headsets, virtual reality (VR) glasses, or VR headsets, etc.

[0074] Figure 4 This is a schematic diagram of the structure of the cooling fan 2 and the housing 1 provided in an embodiment of this application; Figure 5 for Figure 4 A schematic diagram of the cooling fan 2 and housing 1 from another perspective. (Refer to...) Figure 4 and Figure 5 The electronic device provided in this application embodiment has a cooling fan 2 installed inside. The cooling fan 2 can be installed on the housing 1 of the electronic device or on other components of the electronic device. In this application embodiment, the cooling fan 2 is installed on the housing 1, and the housing 1 is also provided with heat dissipation holes 101, through which air inside the cooling fan 2 can be discharged.

[0075] Figure 6 for Figure 4 The diagram shows a cross-sectional view of the cooling fan 2. (Refer to...) Figure 6The cooling fan 2 provided in this embodiment includes a base 201, a hollow rotating shaft 202, and a support column 203. The base 201 is used to install inside an electronic device. The hollow rotating shaft 202 is rotatably connected to the base 201 and is equipped with fan blades 211. The hollow rotating shaft 202 can rotate relative to the base 201 to drive the fan blades 211 to rotate. The support column 203 is disposed in the hollow area of ​​the hollow rotating shaft 202. One end of the support column 203 is connected to the base 201. A limiting part 2031 is provided at the end of the support column 203 away from the base 201. The side of the limiting part 2031 away from the base 201 is used to abut against the housing 1 of the electronic device. Along the radial direction of the support column 203, the dimension of the side of the limiting part 2031 away from the base 201 is larger than the diameter of the hollow rotating shaft 202.

[0076] It should be noted that the cooling fan 2 also includes a stator coil 204 and a rotor magnet 205. The stator coil 204 is usually connected to the base 201, and the rotor magnet 205 can be connected to the hollow shaft 202 through the motor housing 206. The fan blade 211 can also be connected to the hollow shaft 202 through the motor housing 206. When the stator coil 204 is energized, the stator coil 204 and the rotor magnet 205 work together to make the fan blade 211 rotate relative to the base 201, thereby causing airflow to achieve heat dissipation.

[0077] It should be noted that in some embodiments, the support column 203 can be directly connected to the base 201. In this case, the support column 203 can be fixed to the base 201 by means of riveting, threaded connection, snap-fit ​​connection, etc. In other embodiments, the support column 203 can be indirectly connected to the base 201, that is, the support column 203 is connected to the base 201 through other components, and the support column 203 and the base 201 do not directly contact each other.

[0078] It should be noted that the Z-axis direction in the figure is the thickness direction of the electronic device, the radial direction of the support column 203 is perpendicular to the thickness direction of the electronic device, and the radial direction of the support column 203 can be any direction parallel to the plane containing the X-axis and Y-axis in the figure.

[0079] It should be noted that the "diameter" in the above description refers to the outer diameter (i.e., outer diameter) of the component. In the embodiments of this application, when the cross-section of a component is annular, the diameter of this component refers to its outer diameter (i.e., outer diameter). The dimension of the side of the limiting part 2031 facing away from the base 201 is larger than the diameter of the hollow rotating shaft 202, which means that the dimension of the limiting part 2031 is larger than the outer diameter (i.e., outer diameter) of the hollow rotating shaft 202.

[0080] Figure 7 This is a schematic cross-sectional view of the limiting portion 2031 provided in an embodiment of this application. It should be noted that, referring to... Figure 7The cross-sectional shape of the limiting part 2031 can be a regular or irregular shape such as a circle, ellipse, triangle, quadrilateral, pentagon, or hexagon, and this embodiment does not impose any limitations. When the cross-sectional shape of the limiting part 2031 is circular, the dimension of the side of the limiting part 2031 away from the base 201 is the diameter of the limiting part 2031; when the cross-sectional shape of the limiting part 2031 is other shapes, the dimension of the side of the limiting part 2031 away from the base 201 can be the maximum dimension Lmax of the cross-section of the limiting part 2031. In this embodiment, the cross-sectional shape of the limiting part 2031 is circular.

[0081] The cooling fan 2 provided in this application embodiment has a side dimension of the limiting part 2031 away from the base 201 that is larger than the diameter of the hollow rotating shaft 202. This increases the contact area between the limiting part 2031 and the housing 1, improves the support effect on the housing 1 of the electronic device, and reduces the degree of bending deformation of the housing 1 under pressure. In this way, the problem of the housing 1 easily coming into contact with the rotating structure of the cooling fan 2 under pressure can be solved from the root, thereby reducing the possibility of the cooling fan 2 emitting sharp abnormal noise or stopping. Even if the distance between the housing 1 and the rotating structure of the cooling fan 2 (such as the fan blade 211, motor housing 206, etc.) is small, the housing 1 is still not easy to come into contact with the rotating structure of the cooling fan 2 under pressure because the bending deformation of the housing 1 is small. Conversely, the effective support of the limiting part 2031 of the cooling fan 2 for the housing 1 can reduce the bending deformation of the housing 1 under pressure. This can appropriately reduce the distance between the housing 1 and the rotating structure of the cooling fan 2, which helps to reduce the thickness of the electronic device and realize the lightweight design of the electronic device.

[0082] Reference Figure 6 The outer side of the support column 203 and the inner side of the hollow rotating shaft 202 are spaced apart.

[0083] It should be noted that there is a gap between the support column 203 and the hollow rotating shaft 202. When the hollow rotating shaft 202 rotates relative to the support column 203, even if the central axis of the hollow rotating shaft 202 deviates from the central axis of the support column 203, the inner surface of the hollow rotating shaft 202 will never directly contact the outer surface of the support column 203. That is, under no circumstances will the inner surface of the hollow rotating shaft 202 directly contact the outer surface of the support column 203. However, it is not ruled out that the inner surface of the hollow rotating shaft 202 may indirectly contact the outer surface of the support column 203 through other components (such as bearings).

[0084] Understandably, when the cooling fan 2 is operating, the hollow shaft 202 will rotate relative to the support column 203, and the outer side of the support column 203 and the inner side of the hollow shaft 202 will be spaced apart. The hollow shaft 202 and the support column 203 will not make direct contact. This can reduce or even prevent wear between the support column 203 and the hollow shaft 202, which helps to extend the service life of the cooling fan 2.

[0085] Figure 8 This is a cross-sectional view of the second bearing 216, hollow shaft 202, and support column 203 after assembly, as provided in the embodiments of this application.

[0086] Reference Figure 8 The cooling fan 2 also includes a second bearing 216, which is sleeved on the outer periphery of the hollow rotating shaft 202 and coaxially arranged with the support column 203. The second bearing 216 is fixedly connected to the base 201. (Refer to...) Figure 8 In (a), the second bearing 216 and the hollow shaft 202 are clearance-fitted. For example, the outer ring of the second bearing 216 can be fixedly connected to the base 201, while the inner ring of the second bearing 216 is clearance-fitted to the hollow shaft 202. (Refer to...) Figure 8 In (b), when the central axis of the hollow shaft 202 deviates to the point that the outer side of the hollow shaft 202 comes into contact with the second bearing 216, the inner side of the hollow shaft 202 remains spaced from the outer side of the support column 203.

[0087] Reference Figure 6 In some embodiments, a lubricant (such as lubricating oil) may be added between the hollow shaft 202 and the support column 203 to reduce the possibility of friction between the support column 203 and the hollow shaft 202. An annular first oil seal 212 may be provided between the support column 203 and the hollow shaft 202 to reduce lubricant leakage.

[0088] Continue to refer to Figure 6 In some embodiments, a lubricant (such as lubricating oil) may be added between the hollow shaft 202 and the base 201, which can reduce the possibility of friction between the hollow shaft 202 and the base 201. An annular second oil seal 213 may be provided between the hollow shaft 202 and the base 201 to reduce lubricant leakage.

[0089] Continue to refer to Figure 6 In some embodiments, a wear-resistant plate 214 may be provided between the hollow shaft 202 and the base 201, which can reduce the mutual wear between the hollow shaft 202 and the base 201 and help improve the service life of the cooling fan 2.

[0090] Figure 9A cross-sectional view of the cooling fan 2 and housing 1 provided in another embodiment of this application; Figure 10 A cross-sectional view of the cooling fan 2 and housing 1 provided in another embodiment of this application; Figure 11 This is a cross-sectional view of the cooling fan 2 and housing 1 provided in another embodiment of this application.

[0091] Reference Figures 9 to 11 The cooling fan 2 also includes a first bearing 215, which is arranged around the central axis of the support column 203 and located between the support column 203 and the hollow rotating shaft 202.

[0092] It should be noted that the first bearing 215 can be installed in the space between the support column 203 and the hollow rotating shaft 202, and the hollow rotating shaft 202 can form indirect contact with the support column 203 through the first bearing 215.

[0093] Installing the first bearing 215 between the support column 203 and the hollow rotating shaft 202 can reduce the possibility of relative friction between the support column 203 and the hollow rotating shaft 202, thereby improving the service life of the cooling fan 2.

[0094] Figure 12 A cross-sectional view of the assembled first bearing 215, second bearing 216, hollow shaft 202, and support column 203 according to an embodiment of this application. (Refer to...) Figure 12 In some embodiments, the first bearing 215 is fixedly connected to the support column 203, and the first bearing 215 is clearance-fitted with the hollow rotating shaft 202. In this case, the first bearing 215 and the support column 203 are coaxially arranged, and the first bearing 215 is mounted on the support column 203.

[0095] Figure 13 This is an exploded view of the structure of the first bearing 215 provided in an embodiment of this application. It should be noted that, referring to... Figure 13 The first bearing 215 includes a first connecting part 2151 and a second connecting part 2152 rotatably disposed on the outer periphery of the first connecting part 2151. In this embodiment, the first connecting part 2151 of the first bearing 215 is fixedly connected to the support column 203, and the second connecting part 2152 of the first bearing 215 is clearance-fitted with the hollow rotating shaft 202.

[0096] The first bearing 215 is fixedly connected to the support column 203, and the first bearing 215 is clearance-fitted with the hollow rotating shaft 202. This reduces the assembly difficulty of the first bearing 215, the support column 203, and the hollow rotating shaft 202, thus helping to improve the assembly efficiency of the cooling fan 2.

[0097] In some embodiments, a lubricant (such as lubricating oil) may be added between the first bearing 215 and the hollow shaft 202.

[0098] Continue to refer to Figure 12 The cooling fan 2 also includes a second bearing 216, which is sleeved on the outer periphery of the hollow rotating shaft 202 and coaxially arranged with the support column 203. The second bearing 216 is fixedly connected to the base 201, and there is a clearance fit between the second bearing 216 and the hollow rotating shaft 202. (Refer to...) Figure 12 In (b), when a portion of the outer surface of the hollow shaft 202 contacts the second bearing 216, the first bearing 215 contacts both the hollow shaft 202 and the support column 203; refer to Figure 12 In (a), when the outer surface of the hollow shaft 202 is separated from the second bearing 216, the first bearing 215 is separated from the corresponding hollow shaft 202.

[0099] It should be noted that, in this embodiment, the second bearing 216 can serve as a connection structure between the hollow shaft 202 and the base 201. The first connecting part 2151 of the first bearing 215 can be fixed to the support column 203 by means of riveting, threaded connection, interference fit, etc. In addition, the first bearing 215 and the hollow shaft 202 are clearance fitted.

[0100] When a portion of the outer surface of the hollow shaft 202 contacts the second bearing 216, the first bearing 215 contacts the hollow shaft 202 and the support column 203. The outer and inner surfaces of the hollow shaft 202 can simultaneously contact the second bearing 216 and the first bearing 215, thereby dispersing the force, reducing the load on the second bearing 216 under high load scenarios, reducing eccentric wear, and helping to enhance the overall rigidity of the cooling fan 2.

[0101] Figure 14 A cross-sectional view of the assembled first bearing 215, second bearing 216, hollow shaft 202, and support column 203, according to another embodiment of this application. (Refer to...) Figure 14 In other embodiments, the first bearing 215 is clearance-fitted with the support column 203, and the first bearing 215 is fixedly connected to the hollow rotating shaft 202. In this case, the first bearing 215 and the hollow rotating shaft 202 are coaxially arranged, and the first bearing 215 is mounted on the hollow rotating shaft 202.

[0102] It should be noted that, referring to Figure 13 The first bearing 215 includes a first connecting part 2151 and a second connecting part 2152 rotatably disposed on the outer periphery of the first connecting part 2151. In this embodiment, the first connecting part 2151 of the first bearing 215 is clearance-fitted with the support column 203, and the second connecting part 2152 of the first bearing 215 is fixedly connected to the hollow rotating shaft 202.

[0103] By fitting the first bearing 215 with the support column 203 with a clearance and fixing the first bearing 215 with the hollow rotating shaft 202, the assembly difficulty of the first bearing 215 with the support column 203 and the hollow rotating shaft 202 can be reduced, thus helping to improve the assembly efficiency of the cooling fan 2.

[0104] In some embodiments, a lubricant (such as lubricating oil) may be added between the first bearing 215 and the support column 203.

[0105] Continue to refer to Figure 9 and Figure 14 The cooling fan 2 also includes a second bearing 216, which is sleeved on the outer periphery of the hollow rotating shaft 202 and coaxially arranged with the support column 203. The second bearing 216 is fixedly connected to the base 201, and there is a clearance fit between the second bearing 216 and the hollow rotating shaft 202. (Refer to...) Figure 14 In (b), when a portion of the outer surface of the hollow shaft 202 contacts the second bearing 216, the first bearing 215 contacts both the hollow shaft 202 and the support column 203; refer to Figure 14 In (a), when the outer side of the hollow rotating shaft 202 is separated from the second bearing 216, the first bearing 215 is separated from the corresponding support column 203.

[0106] It should be noted that, in this embodiment, the second bearing 216 can reduce the friction between the hollow shaft 202 and the base 201. The second connecting part 2152 of the first bearing 215 can be fixed to the hollow shaft 202 by means of riveting, threaded connection, interference fit, etc. In addition, the first bearing 215 and the support column 203 are clearance fitted.

[0107] When a portion of the outer surface of the hollow shaft 202 contacts the second bearing 216, the first bearing 215 contacts the hollow shaft 202 and the support column 203. The outer and inner surfaces of the hollow shaft 202 can simultaneously contact the second bearing 216 and the first bearing 215, thereby dispersing the force. This can also reduce the load on the second bearing 216 under high load conditions, reduce eccentric wear, and help enhance the overall rigidity of the cooling fan 2.

[0108] In some embodiments, the first bearing 215 may be a bearing in the form of tapered roller bearing, deep groove ball bearing, cylindrical roller bearing, crossed roller bearing, needle roller bearing, angular contact ball bearing, magnetic bearing, etc., and the embodiments of this application are not limited herein.

[0109] In some embodiments, the second bearing 216 may be a bearing in the form of tapered roller bearing, deep groove ball bearing, cylindrical roller bearing, crossed roller bearing, needle roller bearing, angular contact ball bearing, magnetic bearing, etc., and the embodiments of this application are not limited herein.

[0110] In some embodiments, the first bearing 215 is fixedly connected to the support column 203 and the hollow rotating shaft 202, respectively.

[0111] It should be noted that, referring to Figure 13 The first bearing 215 includes a first connecting part 2151 and a second connecting part 2152 rotatably disposed on the outer periphery of the first connecting part 2151. In this embodiment, the first connecting part 2151 of the first bearing 215 is fixedly connected to the support column 203, and the second connecting part 2152 of the first bearing 215 is fixedly connected to the hollow rotating shaft 202.

[0112] By fixing the first bearing 215 to the support column 203 and the hollow rotating shaft 202 respectively, the force on the support column 203 and the hollow rotating shaft 202 can be balanced, reducing eccentric wear and extending the service life of the cooling fan 2.

[0113] In addition, continue to refer to Figure 13 Since the first bearing 215 is fixedly connected to the support column 203 and the hollow shaft 202 respectively, the movement of the hollow shaft 202 that deviates from the central axis of the support column 203 when it rotates is less, and the possibility of friction between the outer surface of the hollow shaft 202 and the base 201 is less. Therefore, the cooling fan 2 does not need to be equipped with a second bearing 216. In this way, the number of parts required for the cooling fan 2 can be reduced, which helps to simplify the structure of the cooling fan 2.

[0114] In the embodiments of this application, reference is made to Figure 12 In some cases, the first connecting part 2151 of the first bearing 215 is fixedly connected to the support column 203, and the second connecting part 2152 of the first bearing 215 is clearance-fitted with the hollow rotating shaft 202. The cooling fan 2 is also provided with a second bearing 216, the outer ring of the second rotating shaft is fixed to the base 201, and the inner ring of the second rotating shaft is clearance-fitted with the hollow rotating shaft 202. (Refer to...) Figure 10 and Figure 11 In other cases, the first connecting part 2151 of the first bearing 215 is fixedly connected to the support column 203, and the second connecting part 2152 of the first bearing 215 is fixedly connected to the hollow rotating shaft 202. The cooling fan 2 may not be equipped with a second bearing 216. A gap may be provided between the outer side of the hollow rotating shaft 202 and the base 201 to reduce friction.

[0115] Continue to refer to Figure 13 In some embodiments, the first bearing 215 is a crossed roller bearing.

[0116] It should be noted that the first bearing 215 includes a first connecting portion 2151 and a second connecting portion 2152 rotatably disposed on the outer periphery of the first connecting portion 2151. When the first bearing 215 is a crossed roller bearing, the first bearing 215 also includes rollers 2153 and a cage 2154 disposed between the first connecting portion 2151 and the second connecting portion 2152. The rollers 2153 are mounted on the cage 2154. Multiple rollers 2153 are provided, and the multiple rollers 2153 are spaced apart around the central axis of the first connecting portion 2151. The central axes of two adjacent rollers 2153 are perpendicular to each other, so that the rollers 2153 are arranged in a crossed manner.

[0117] Crossed roller bearings arrange rollers 2153 in two different directions in a cross pattern. Under the same load capacity, the radial dimension of crossed roller bearings is smaller than that of traditional bearings, allowing for a more compact structure of the cooling fan 2. Without changing the overall dimensions of the cooling fan 2, the size of the hollow shaft 202 can be reduced, thereby increasing the size of the fan blades 211. In addition, crossed roller bearings have high rigidity and precision, can be used in high-load environments, and rotate smoothly with minimal error during operation.

[0118] Reference Figure 10 In some embodiments, a first bearing 215 is disposed between a support column 203 and a base 201. The first bearing 215 includes a first connecting portion 2151 and a second connecting portion 2152 rotatably disposed on the outer periphery of the first connecting portion 2151. The second connecting portion 2152 can contact the hollow rotating shaft 202. The two ends of the first connecting portion 2151 are fixedly connected to the base 201 and the support column 203, respectively.

[0119] It should be noted that when the second connecting part 2152 is fixedly connected to the hollow rotating shaft 202, the second connecting part 2152 can be interference-fitted with the hollow rotating shaft 202. When the second connecting part 2152 is not fixedly connected to the hollow rotating shaft 202, the second connecting part 2152 can be clearance-fitted with the hollow rotating shaft 202.

[0120] It should be noted that in some embodiments, the first connecting part 2151 and the support column 203 can be fixed together by an interference fit, while in other embodiments, the first connecting part 2151 and the support column 203 can be fixed together by riveting, threaded connection, snap-fit ​​connection, adhesive bonding, etc. This application embodiment does not impose such limitations. Similarly, in some embodiments, the first connecting part 2151 and the base 201 can be fixed together by an interference fit, while in other embodiments, the first connecting part 2151 and the base 201 can be fixed together by riveting, threaded connection, snap-fit ​​connection, adhesive bonding, etc. This application embodiment does not impose such limitations. For example, Figure 10The support column 203 shown is riveted to the first connecting part 2151 of the first bearing 215, and the first connecting part 2151 of the first bearing 215 is fixed to the base 201 by screws.

[0121] In this embodiment, when the hollow shaft 202 rotates away from the central axis of the support column 203, the second connecting part 2152 will be squeezed against the first connecting part 2151 in the radial direction of the support column 203. Since the support column 203 is not directly connected to the base 201, there will be no shear force between the support column 203 and the base 201 due to the squeezing of the first connecting part 2151. In this way, the wear on the support column 203 can be reduced.

[0122] In some embodiments, the first connection part 2151 can be made of a material with good rigidity and wear resistance, which helps to improve the overall rigidity of the cooling fan 2 and helps to control the manufacturing cost of the cooling fan 2.

[0123] Figure 15 An exploded view of the structure of the first bearing 215 provided in another embodiment of this application. (Refer to...) Figure 11 and Figure 15 In some embodiments, the support column 203 passes through the first bearing 215.

[0124] It should be noted that the first bearing 215 includes a first connecting portion 2151 and a second connecting portion 2152 rotatably disposed on the outer periphery of the first connecting portion 2151. In this embodiment, the first connecting portion 2151 may be provided with a mounting hole, and the support column 203 may pass through the mounting hole of the first connecting portion 2151 and be connected to the base 201. The support column 203 and the base 201 can be fixed together by riveting, threaded connection, snap-fit ​​connection, etc., and this embodiment of the application does not impose any limitations. In this embodiment, the support column 203 and the base 201 are fixed together by riveting.

[0125] By having the support column 203 pass through the first bearing 215, the customization difficulty of applying the first bearing 215 to the cooling fan 2 can be reduced, and the complexity of component design can be reduced, thus helping to reduce the cost of the cooling fan 2.

[0126] Figure 16 A cross-sectional view of the cooling fan 2 and housing 1 provided in another embodiment of this application; Figure 17 for Figure 16 The diagram shows the structure of the cooling fan 2. (Refer to...) Figure 16 and Figure 17The cooling fan 2 includes a first cover plate 207, a base 201 connected to the first cover plate 207, a baffle 209 provided on the edge of one side of the first cover plate 207, a hollow rotating shaft 202 and a support column 203 both provided in the enclosed area of ​​the baffle 209 and the first cover plate 207, a sealing element 210 provided on the side of the baffle 209 away from the first cover plate 207, the sealing element 210 is used to abut against the side of the housing 1 to seal the gap between the baffle 209 and the housing 1.

[0127] It should be noted that the base 201 and the first cover plate 207 can be fixedly connected by screws or other fasteners, or by riveting, or by adhesive bonding. The first cover plate 207 and the enclosure 209 can be an integral structure or two separate parts, each manufactured separately.

[0128] It should be noted that the enclosure 209 can be set in three edge areas on one side of the first cover plate 207, so that the remaining edge can form an opening with the housing 1 at intervals, through which air can flow.

[0129] A sealing element 210 is provided on the side of the enclosure 209 away from the first cover plate 207. When the cooling fan 2 is installed on the housing 1 of the electronic device, the sealing element 210 can seal the gap between the enclosure 209 and the housing 1, so that the air blown out by the cooling fan 2 can flow in a direction and improve the heat dissipation capacity of the electronic device.

[0130] In some embodiments, the seal 210 may be foam, sealing strip, etc.

[0131] Figure 18 This is a schematic diagram of the structure of a cooling fan 2 provided in one embodiment of this application. (Refer to...) Figure 18 In other embodiments, the cooling fan 2 includes a first cover plate 207 and a second cover plate 208 spaced apart. A baffle 209 is provided on the edge of the first cover plate 207 facing the second cover plate 208. The side of the baffle 209 opposite to the first cover plate 207 is connected to the second cover plate 208. A hollow rotating shaft 202 and a support column 203 are both disposed within the enclosed area of ​​the first cover plate 207, the second cover plate 208, and the baffle 209. The side of the second cover plate 208 opposite to the first cover plate 207 is used to abut against the housing 1. Compared to... Figure 16 and Figure 17 The cooling fan 2 shown is... Figure 18 The side of the enclosure 209 of the cooling fan 2 shown may not have a seal 210.

[0132] A second cover plate 208 is provided on one side of the first cover plate 207. The side of the second cover plate 208 facing away from the first cover plate 207 is used to abut against the housing 1 of the electronic device. The second cover plate 208 can provide support for the housing 1, thereby reducing the deformation of the housing 1.

[0133] In addition, compared to Figure 18 The cooling fan 2 shown is... Figure 16 and Figure 17 The cooling fan 2 shown does not have a second cover plate 208, therefore, Figure 16 and Figure 17 The overall thickness of the cooling fan 2 shown can be less than Figure 18 The cooling fan 2 shown; of course, in other embodiments, Figure 16 and Figure 17 The cooling fan 2 shown can utilize the space created after removing the second cover plate 208 to appropriately increase the size of the fan blades 211, thereby improving the cooling capacity of the cooling fan 2.

[0134] This application also provides an electronic device, including a housing 1 and a cooling fan 2 as described in any of the above embodiments, wherein the limiting part 2031 of the cooling fan 2 abuts against the side of the housing 1.

[0135] It should be noted that the housing 1 of the electronic device can be the rear housing of the electronic device.

[0136] Optionally, the electronic device may also include a display screen, with a cooling fan 2 located between the housing 1 and the display screen.

[0137] Since the cooling fan 2 in any of the above embodiments provides good support for the housing 1 of the electronic device, it can reduce the degree of bending deformation of the housing 1 under pressure. Therefore, the housing 1 of the electronic device containing this cooling fan 2 is less likely to bend under pressure, and the housing 1 is less likely to come into contact with the rotating structure of the cooling fan 2. This reduces the possibility of the electronic device making a sharp noise or stopping under pressure, and the reliability of the electronic device is high. In addition, since the bending deformation of the housing 1 is small under pressure, the housing 1 is still less likely to come into contact with the rotating structure of the cooling fan 2 after being compressed. The distance between the housing 1 and the rotating structure of the cooling fan 2 can be appropriately reduced, which helps to reduce the thickness of the electronic device and achieve a thinner and lighter design.

[0138] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooling fan, characterized in that, include: Base, the base being used for mounting within an electronic device; A hollow rotating shaft is rotatably connected to the base, and a fan blade is mounted on the hollow rotating shaft. The hollow rotating shaft can rotate relative to the base to drive the fan blade to rotate. A support column is disposed within the hollow region of the hollow rotating shaft. One end of the support column is connected to the base. A limiting part is provided at the end of the support column facing away from the base. The side of the limiting part facing away from the base is used to abut against the housing of the electronic device. Along the radial direction of the support column, the dimension of the side of the limiting part facing away from the base is larger than the diameter of the hollow rotating shaft.

2. The cooling fan according to claim 1, characterized in that, The outer side of the support column and the inner side of the hollow rotating shaft are spaced apart.

3. The cooling fan according to claim 2, characterized in that, The cooling fan also includes a first bearing, which is arranged around the central axis of the support column and located between the support column and the hollow rotating shaft.

4. The cooling fan according to claim 3, characterized in that, The first bearing is fixedly connected to the support column, and the first bearing is clearance-fitted with the hollow rotating shaft; Alternatively, the first bearing may be clearance-fitted with the support column, or the first bearing may be fixedly connected to the hollow rotating shaft.

5. The cooling fan according to claim 4, characterized in that, The cooling fan also includes a second bearing, which is sleeved on the outer periphery of the hollow rotating shaft and coaxially arranged with the support column. The second bearing is fixedly connected to the base, and there is a clearance fit between the second bearing and the hollow rotating shaft. When a portion of the outer surface of the hollow shaft contacts the second bearing, the first bearing contacts both the hollow shaft and the support column. When the outer surface of the hollow shaft is separated from the second bearing, the first bearing is separated from the corresponding hollow shaft or the support column.

6. The cooling fan according to claim 3, characterized in that, The first bearing is fixedly connected to the support column and the hollow rotating shaft respectively.

7. The cooling fan according to any one of claims 3-6, characterized in that, The first bearing is a crossed roller bearing.

8. The cooling fan according to any one of claims 3-6, characterized in that, The support column passes through the first bearing.

9. The cooling fan according to any one of claims 3-6, characterized in that, The first bearing is disposed between the support column and the base. The first bearing includes a first connecting part and a second connecting part rotatably disposed on the outer periphery of the first connecting part. The second connecting part can contact the hollow rotating shaft. The two ends of the first connecting part are fixedly connected to the base and the support column, respectively.

10. The cooling fan according to any one of claims 1-6, characterized in that, The cooling fan includes a first cover plate, the base is connected to the first cover plate, a baffle is provided on the edge of one side of the first cover plate, the hollow rotating shaft and the support column are both provided in the enclosed area of ​​the baffle and the first cover plate, a sealing element is provided on the side of the baffle away from the first cover plate, the sealing element is used to abut against the side of the housing to seal the gap between the baffle and the housing.

11. An electronic device, comprising a housing, characterized in that, It also includes a cooling fan as described in any one of claims 1-10, wherein the limiting portion of the cooling fan abuts against the side of the housing.

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