Rotating assembly and cooling fan

Abstract

The utility model provides a rotating assembly and a cooling fan, and relates to the technical field of fans. The rotating assembly comprises a shaft center and a bearing, the shaft center is sleeved with the bearing and is in running fit with the bearing, the tail end of the shaft center extends out of the bearing through the upper end of the bearing and is used for installing a plurality of fan blades, and the head end (opposite to the tail end) of the shaft center extends out of the bearing through the lower end (opposite to the upper end) of the bearing and is larger than the inner diameter of the bearing. Therefore, when the axis axially moves due to falling of the cooling fan, the head end of the axis can abut against the end face of the lower end of the bearing, the axis is prevented from being clamped in the bearing, and fan blades are prevented from being clamped. Therefore, a retaining ring in a traditional scheme can be omitted on the premise that the fan blades are prevented from being clamped, so that the design space of the bearing is enlarged, it is guaranteed that the bearing has enough length to support the axis, friction damage and friction sound between the axis and the bearing can be effectively weakened when the cooling fan operates, and the service life of the cooling fan is prolonged. And finally, the sound quality and the service life of the cooling fan are improved.

Description

Technical Field

[0001] This application relates to the field of fan technology, and more particularly to a rotating component and a cooling fan. Background Technology

[0002] As the name suggests, a cooling fan is a fan specifically designed for heat dissipation. Its cooling principle involves using a motor to drive fan blades to rotate and generate airflow, which then carries away heat from the surface of an object, ultimately achieving heat dissipation. Taking a laptop as an example, it typically contains components such as a CPU (Central Processing Unit) and a graphics card. These components easily generate heat during operation, so multiple cooling fans are needed inside the laptop to dissipate heat from these components. This prevents damage from overheating and ensures the normal operation of the laptop. Generally, the cooling fans used in laptops need to meet the requirements of low noise and a thin, light design.

[0003] In related technologies, cooling fans can have either a retaining ring or not. When a retaining ring is present, it axially positions the fan's shaft, preventing axial movement during operation. Without a retaining ring, if the fan is subjected to an external impact (such as a drop), the shaft may become stuck in the bearing due to the lack of axial positioning, ultimately causing the fan blades to jam. However, if a retaining ring is used to prevent blade jamming, it inevitably occupies space originally intended for the bearing. For thin and light cooling fans, this further shortens the already short bearing, resulting in insufficient support for the shaft. This leads to friction damage and noise between the shaft and bearing during operation, reducing the fan's sound quality, shortening its lifespan, and negatively impacting the user experience of the laptop. Utility Model Content

[0004] This application provides a rotating component and a cooling fan, which aims to solve the problem in the related art that thin and light cooling fans cannot simultaneously achieve sound quality, service life and blade jamming.

[0005] To address the aforementioned drawbacks in related technologies, the first aspect of this application provides a rotating assembly applied in a cooling fan with multiple blades. The assembly includes a shaft, a bearing, and a bushing. The bearing has opposing lower and upper ends, the shaft has opposing head and tail ends, and the bushing has a receiving cavity. One end of the bushing has an opening communicating with the receiving cavity. The bearing is fitted onto the shaft and rotatably engages with it. The bushing is fitted onto the lower end of the bearing to house both the bearing and the shaft within the receiving cavity. The tail end of the shaft extends beyond the receiving cavity via the upper end of the bearing and is used to mount multiple blades. The head end of the shaft extends beyond the bearing via the lower end of the bearing, and the size of the head end of the shaft is larger than the inner diameter of the bearing.

[0006] In some implementations, the shaft includes a shaft body, a bearing is fitted onto the shaft body, and one end of the shaft body extends beyond the lower end of the bearing to form a ball head, the size of which is larger than the inner diameter of the bearing. Preferably, the ball head is spaced apart from the lower end of the bearing to form an oil reservoir gap, which is used to accommodate lubricating oil stored in the receiving cavity.

[0007] In some implementations, the end of the shaft body without a ball joint extends from the upper end of the bearing to the outside of the receiving cavity. A transition column extending along the axis of the shaft body is formed at the end of the shaft body outside the receiving cavity. A mounting column extending along the axis of the shaft body is formed at the end of the transition column away from the shaft body. The end of the mounting column away from the transition column is used to mount multiple fan blades. Preferably, the size of the mounting column is adapted to the inner diameter of the bearing, and the size of the transition column is smaller than the inner diameter of the bearing.

[0008] In some implementations, the bushing includes a lower annular column, an upper annular column, and a base. A groove is provided in the middle of the base. The lower annular column is located on the base and surrounds the groove. The upper annular column is located on the lower annular column. The base, the lower annular column, and the upper annular column together form a receiving cavity. The lower end of the bearing abuts against the base. The side wall of the bearing near the lower end abuts against the inner wall of the lower annular column. The head end of the shaft extends into the groove through the lower end of the bearing. The upper annular column and the bearing are spaced apart to form an annular gap.

[0009] In some implementations, the rotating assembly further includes a pressure ring, which is fitted onto the upper end of the bearing and located within the annular gap. In one or more of these implementations, the pressure ring includes a pressure plate and an annular retaining portion extending from the periphery of the pressure plate in a direction perpendicular to the pressure plate. The pressure plate presses against the end face of the upper end of the bearing, the annular retaining portion is inserted into the annular gap, and the annular retaining portion is spaced apart from the bearing. The side of the annular retaining portion away from the bearing abuts against the inner wall of the upper annular cylinder. A through hole is provided in the middle of the pressure plate for the tail end of the shaft to pass through so that the tail end of the shaft extends out of the receiving cavity.

[0010] In some implementations, the rotating assembly also includes a wear-resistant plate located within the receiving cavity. The wear-resistant plate is disposed on the groove wall of the groove relative to the opening, and the wear-resistant plate is in contact with the head end of the shaft.

[0011] The second aspect of this application provides a cooling fan, which includes a housing, a plurality of fan blades, and a rotating assembly provided in the first aspect of this application. The rotating assembly and the plurality of fan blades are both disposed within the housing, and the plurality of fan blades are all mounted on the tail end of the central axis of the rotating assembly.

[0012] The rotating assembly provided in the first aspect of this application comprises a shaft, a bearing, and a bushing. The bushing has a receiving cavity and an opening at one end communicating with the receiving cavity. The bearing is sleeved on the shaft and rotates with it. The bushing is sleeved on the lower end of the bearing, housing both the bearing and the shaft within the receiving cavity. The tail end of the shaft extends beyond the receiving cavity via the upper end (opposite to the lower end) of the bearing and is used to mount multiple fan blades. The head end of the shaft (opposite to the tail end) extends beyond the bearing via the lower end, and the size of the head end of the shaft is larger than the inner diameter of the bearing. It is understood that when the rotating assembly is applied to a cooling fan with multiple fan blades, a motor can drive the shaft to rotate within the bearing, thereby rotating the multiple fan blades mounted at the tail end of the shaft and generating airflow. This airflow then carries away heat from the surface of the object, ultimately achieving heat dissipation. During actual operation of a cooling fan, when the fan is impacted by external force (such as being dropped), although the shaft may tend to move axially within the bearing, the shaft tip, located outside the bearing and larger than its inner diameter, will press against the lower end face of the bearing during this axial movement. This prevents the shaft from getting stuck within the bearing, thus avoiding blade jamming even without a retainer. Therefore, compared to traditional cooling fans with retainers, this application eliminates the need for a retainer while preventing blade jamming, thereby increasing the bearing's design space and ensuring sufficient bearing length to support the shaft. This reduces frictional damage and noise between the shaft and bearing during fan operation, ultimately improving the cooling fan's sound quality and lifespan.

[0013] The cooling fan provided in the second aspect of this application uses the rotating component provided in the first aspect of this application, and therefore has all the advantages of the rotating component. Attached Figure Description

[0014] To more clearly illustrate the related technologies or the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the related technologies or the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application, and not all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A cross-sectional view of a rotating assembly provided in an embodiment of this application;

[0016] Figure 2 A cross-sectional view of the bushing provided in an embodiment of this application;

[0017] Figure 3 A schematic diagram of the structure of the shaft provided in the embodiments of this application;

[0018] Figure 4 A cross-sectional view of another rotating component provided in an embodiment of this application.

[0019] The labels for each figure are as follows: 1-shaft, 2-bearing, 3-shoulder sleeve, 4-pressure ring, 5-wear-resistant plate, 11-shaft body, 12-ball head, 13-transition column, 14-mounting column, 31-accommodating cavity, 32-chassis, 33-lower annular column, 34-upper annular column, 311-opening, 312-gap, 313-oil storage gap, 314-annular gap, 321-groove, 41-pressure plate, 42-annular enclosure, 411-through hole. Detailed Implementation

[0020] In related technologies, if a retaining ring is used to prevent the cooling fan blades from getting stuck, the retaining ring will inevitably occupy the space originally designed for the bearing. For the thin and light cooling fans in laptops, this will undoubtedly further shorten the already short bearing, ultimately resulting in insufficient support of the bearing for the shaft. Consequently, friction damage and noise can easily occur between the shaft and the bearing during the operation of the cooling fan, affecting not only the sound quality and lifespan of the cooling fan but also the user's experience with the laptop. Therefore, this application proposes a rotating component and a cooling fan in the embodiments below to solve the aforementioned drawbacks of the related technologies.

[0021] To make the objectives, technical solutions, and advantages of this application more apparent and understandable, this application will be clearly and completely described below in conjunction with its embodiments and corresponding drawings. Throughout, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the embodiments of this application described below are only for explaining this application and are not intended to limit this application. That is, all other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0022] Please see Figure 1 as well as Figure 2 , Figure 1 This is a cross-sectional view of a rotating component. Figure 2 This is a cross-sectional view of the bushing. This embodiment provides a rotating assembly that can be applied to a cooling fan with multiple blades. The rotating assembly includes a shaft 1, a bearing 2, and a bushing 3. The bearing 2 has a lower end and an upper end, the shaft 1 has a head end and a tail end, and the bushing 3 has a receiving cavity 31. One end of the bushing 3 has an opening 311 that communicates with the receiving cavity 31. The bearing 2 is sleeved on the shaft 1 and rotates with the shaft 1. The bushing 3 is sleeved on the lower end of the bearing 2 to house both the bearing 2 and the shaft 1 within the receiving cavity 31. The tail end of the shaft 1 extends beyond the receiving cavity 31 via the upper end of the bearing 2 and is used to mount multiple blades of the cooling fan. The head end of the shaft 1 extends beyond the bearing 2 via the lower end of the bearing 2. The size of the head end of the shaft 1 is larger than the inner diameter of the bearing 2. In this embodiment, the upper end of the bearing 2 is located at the opening 311, and the lower end of the bearing 2 is spaced apart from the wall of the receiving cavity 31 relative to the opening 311 to form a gap 312. This gap 312 is used to provide space for the head end of the shaft 1 to extend from the lower end of the bearing 2. That is, the head end of the shaft 1 extends into the gap 312 through the lower end of the bearing 2.

[0023] Specifically, the motor in the cooling fan drives the shaft 1 to rotate within the bearing 2, thereby rotating multiple fan blades mounted at the tail end of the shaft 1 and generating airflow. This airflow then carries away heat from the surface of the object, ultimately achieving heat dissipation. During actual operation, when the cooling fan is impacted (e.g., dropped), although the shaft 1 may tend to move axially within the bearing 2, the head end of the shaft 1, located outside the bearing 2 and larger than its inner diameter, will press against the lower end face of the bearing 2 during this axial movement. This effectively prevents the shaft 1 from getting stuck within the bearing 2, thus avoiding blade jamming even without a retainer.

[0024] As can be seen from the above, compared with the traditional cooling fan with a retaining ring, this embodiment can eliminate the retaining ring without the fan blades getting stuck, thereby increasing the design space of the bearing 2 and ensuring that the bearing 2 has enough length to support the shaft 1. This can reduce frictional damage and frictional noise between the shaft 1 and the bearing 2 when the cooling fan is running, and ultimately improve the sound quality and service life of the cooling fan.

[0025] In some embodiments, please refer to Figure 3 , Figure 3 This is a schematic diagram of the shaft structure; the shaft 1 includes a shaft body 11, which is typically cylindrical. A bearing 2 is fitted onto the shaft body 11. One end of the shaft body 11 extends through the lower end of the bearing 2 into a gap 312. A ball head 12 is formed at the end of the shaft body 11 located in the gap 312, and the size of the ball head 12 is larger than the inner diameter of the bearing 2. In other words, the end of the shaft 1 with the ball head 12 serves as the head end of the shaft 1. Preferably, the ball head 12 and the lower end of the bearing 2 are spaced apart to form an oil reservoir gap 313, which is used to accommodate lubricating oil stored in the receiving cavity 31. It is understandable that lubricating oil is usually stored inside the bushing 3 (i.e., inside the receiving cavity 31) to reduce friction, reduce noise and assist in heat dissipation during the operation of the cooling fan. The oil storage gap 313 formed between the ball head 12 and the lower end face of the bearing 2 can not only ensure that there is no contact friction between the ball head 12 and the lower end of the bearing 2 during the operation of the cooling fan, but also accommodate the lubricating oil stored in the bushing 3. This is equivalent to expanding the storage space of lubricating oil inside the bushing 3.

[0026] Furthermore, the end of the shaft body 11 without the ball head 12 extends from the upper end of the bearing 2 to the outside of the receiving cavity 31. A transition column 13 extending along the axis of the shaft body 11 is formed at the end of the shaft body 11 located outside the receiving cavity 31. A mounting column 14 extending along the axis of the shaft body 11 is formed at the end of the transition column 13 away from the shaft body 11. The end of the mounting column 14 away from the transition column 13 is used to mount multiple fan blades of the cooling fan. In other words, the end of the shaft 1 with the transition column 13 and the mounting column 14 serves as the tail end of the shaft 1. Preferably, the shapes of both the transition column 13 and the mounting column 14 are adapted to the shaft body 11 (i.e., both have circular cross-sectional shapes), and the dimensions of the mounting column 14 are adapted to the inner diameter of the bearing 2, while the dimensions of the transition column 13 are smaller than the inner diameter of the bearing 2. It is understood that this application provides a transition column 13 and a mounting column 14 at the tail end of the shaft 1, and installs (e.g., welds) multiple fan blades of the cooling fan on the end of the mounting column 14 away from the transition column 13. This increases the distance between each fan blade and the upper end face of the bearing 2, ensuring that there is no interference between each fan blade and the upper end of the bearing 2 during the operation of the cooling fan.

[0027] In some embodiments, please refer to Figure 2 The bushing 3 includes a base 32, a lower annular column 33, and an upper annular column 34. The base 32 has an inwardly recessed groove 321 in the middle. The lower annular column 33 is disposed on the base 32 and surrounds the groove 321. The lower annular column 33 is offset from the base 32, that is, the lower annular column 33 is adjacent to the edge of the base 32 so that the inner wall of the lower annular column 33 is separated from the groove opening of the groove 321. The upper annular column 34 is disposed on the lower annular column 33. The upper annular column 34 is offset from the lower annular column 33, that is, the upper annular column 34 is adjacent to the edge of the lower annular column 33 so that the inner wall of the upper annular column 34 is separated from the inner wall of the lower annular column 33. The base 32, the lower annular column 33, and the upper annular column 34 together form a receiving cavity 31. Specifically, after the bushing 3 is fitted onto the lower end of the bearing 2, both the bearing 2 and the shaft 1 are housed within the receiving cavity 31. The lower end of the bearing 2 abuts against the chassis 32, and the side wall of the bearing 2 near its lower end abuts against the inner wall of the lower annular column 33. The head end of the shaft 1 extends through the lower end of the bearing 2 into the groove 321. The inner wall of the upper annular column 34 is spaced from the outer wall of the bearing 2 to form an annular gap 314. It can be understood that the wall surface of the receiving cavity 31 relative to the opening 311 is the bottom wall of the groove 321. At the same time, since the lower end of the bearing 2 abuts against the chassis 32, the gap 312 formed between the lower end of the bearing 2 and the wall surface of the receiving cavity 31 relative to the opening 311 is the groove space of the groove 321, so as to accommodate the head end of the shaft 1.

[0028] Further, please refer to Figure 4 , Figure 4 This is a cross-sectional view of another rotating assembly; in addition to the structure given above, the rotating assembly also includes a pressure ring 4, which is sleeved on the upper end of the bearing 2 and located in the annular gap 314. As one or more embodiments, the pressure ring 4 includes a pressure plate 41 and an annular retaining portion 42 extending from the periphery of the pressure plate 41 in a direction perpendicular to the pressure plate 41. The pressure plate 41 presses against the end face of the upper end of the bearing 2, and the annular retaining portion 42 is inserted into the annular gap 314. The annular retaining portion 42 is spaced apart from the bearing 2, and the side of the annular retaining portion 42 away from the bearing 2 abuts against the inner wall of the upper annular column 34. A through hole 411 is provided in the middle of the pressure plate 41, which allows the tail end of the shaft 1 to pass through so that the tail end of the shaft 1 extends through the upper end of the bearing 2 to the outside of the receiving cavity 31. It is understood that, through the tight fit between the pressure ring 4 and the bushing 3, the bearing 2 can be firmly confined within the bushing 3.

[0029] In some embodiments, please refer to Figure 4In addition to the structures listed above, the rotating assembly also includes a wear-resistant plate 5. The wear-resistant plate 5 is located within the receiving cavity 31 and is positioned on the groove wall (i.e., the bottom wall) of the groove 321 relative to the opening 311, and it contacts the head end of the shaft 1. It is understood that the wear-resistant plate 5 is typically made of a material with self-lubricating and high hardness properties, effectively reducing the coefficient of friction, minimizing wear on the head end of the shaft 1, and extending the service life of the cooling fan. The wear-resistant plate 5 helps the cooling fan maintain better stability during high-speed operation, making the rotation of the shaft 1 within the bushing 3 smoother and reducing vibration and shaking caused by uneven friction or component wear, thus ensuring continuous and stable operation of the cooling fan. The presence of the wear-resistant plate 5 buffers the contact between components, reducing noise generated by friction and collision, making the cooling fan quieter during operation and improving the user experience. The wear-resistant plate 5 ensures that the shaft 1 is in the correct position, preventing shaft 1 from shifting and affecting the normal operation of the cooling fan.

[0030] Based on the rotating components described in the preceding embodiments, this application provides an embodiment of a cooling fan. In this embodiment, the cooling fan includes a housing, multiple fan blades, and the rotating component described in any of the preceding embodiments. The rotating component and the multiple fan blades are both disposed within the housing. The multiple fan blades are all mounted on the tail end of the central axis 1 of the rotating component. A ventilation grille corresponding to the multiple fan blades is provided on the housing. Of course, the cooling fan provided in this embodiment, in addition to including the housing, rotating component, and multiple fan blades, should also include other components that constitute a cooling fan in the art, such as a motor, fan bracket, dustproof screen or filter, air guide or guide plate, drive circuit, wires, and interfaces. However, since the technology of cooling fans in the art is relatively mature, this application will not elaborate on these aspects.

[0031] The above embodiments are merely preferred implementations of this application and are not the only limitations on the rotating assembly and the cooling fan using the rotating assembly. Those skilled in the art can make flexible settings based on the above embodiments and according to actual application scenarios. It is understood that through the implementation of the above embodiments of this application, the rotating assembly is constituted by the shaft 1, bearing 2, and bushing 3. The bushing 3 has a receiving cavity 31 and an opening 311 at one end communicating with the receiving cavity 31. The bearing 2 is sleeved on the shaft 1 and rotates with the shaft 1. The bushing 3 is sleeved on the lower end of the bearing 2 and houses both the bearing 2 and the shaft 1 within the receiving cavity 31. The tail end of the shaft 1 extends from the upper end (opposite to the lower end) of the bearing 2 to the outside of the receiving cavity 31 and is used to install multiple fan blades. The head end (opposite to the tail end) of the shaft 1 extends from the lower end of the bearing 2 to the outside of the bearing 2 and its size is larger than the inner diameter of the bearing 2. Understandably, when a rotating component is applied to a cooling fan with multiple blades, a motor can drive the shaft 1 to rotate within the bearing 2, thereby rotating the multiple blades mounted at the tail end of the shaft 1 and generating airflow. This airflow then carries away heat from the surface of the object, ultimately achieving heat dissipation. During actual operation, when the cooling fan is impacted (e.g., dropped), although the shaft 1 may tend to move axially within the bearing 2, because the head of the shaft 1 is located outside the bearing 2 and its size is larger than the inner diameter of the bearing 2, the head of the shaft 1 will press against the lower end face of the bearing 2 during this axial movement. This prevents the shaft 1 from getting stuck within the bearing 2, thus avoiding blade jamming even without a retainer. Therefore, compared with the traditional cooling fan with a retaining ring, this application can eliminate the retaining ring without the fan blades getting stuck, thereby increasing the design space of the bearing 2, ensuring that the bearing 2 has enough length to support the shaft 1, reducing friction damage and friction noise between the shaft 1 and the bearing 2 when the cooling fan is running, and improving the sound quality and service life of the cooling fan.

[0032] It should be noted that the several embodiments shown above in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in the textual description of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply such an actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements may include not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus; and, without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Furthermore, those skilled in the art can implement or use this application by practicing the several embodiments shown above. Various modifications to the embodiments shown above will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments not shown without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the several embodiments shown above, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotating assembly, used in a cooling fan having multiple blades, characterized in that, The device includes a shaft, a bearing, and a bushing. The bearing has a lower end and an upper end, the shaft has a head end and a tail end, and the bushing has a receiving cavity. One end of the bushing has an opening communicating with the receiving cavity. The bearing is sleeved on the shaft and rotates with the shaft. The bushing is sleeved on the lower end of the bearing to house both the bearing and the shaft within the receiving cavity. The tail end of the shaft extends from the upper end of the bearing to the outside of the receiving cavity and is used to mount the plurality of fan blades. The head end of the shaft extends from the lower end of the bearing to the outside of the bearing. The size of the head end of the shaft is larger than the inner diameter of the bearing.

2. The rotating assembly according to claim 1, characterized in that, The shaft includes a shaft body, and the bearing is sleeved on the shaft body. One end of the shaft body extends from the lower end of the bearing to the outside of the bearing and forms a ball head. The size of the ball head is larger than the inner diameter of the bearing.

3. The rotating assembly according to claim 2, characterized in that, The ball head is spaced apart from the lower end of the bearing to form an oil reservoir gap for accommodating the lubricating oil stored in the receiving cavity.

4. The rotating assembly according to claim 2, characterized in that, The end of the shaft body without the ball head extends from the upper end of the bearing to the outside of the receiving cavity. The end of the shaft body located outside the receiving cavity forms a transition column extending along the axis of the shaft body. The end of the transition column away from the shaft body forms a mounting column extending along the axis of the shaft body. The end of the mounting column away from the transition column is used to mount the plurality of fan blades.

5. The rotating assembly according to claim 4, characterized in that, The dimensions of the mounting column are adapted to the inner diameter of the bearing, and the dimensions of the transition column are smaller than the inner diameter of the bearing.

6. The rotating assembly according to claim 1, characterized in that, The bushing includes a lower annular column, an upper annular column, and a base. The base has an inwardly recessed groove in the middle. The lower annular column is disposed on the base and surrounds the groove. The upper annular column is disposed on the lower annular column. The base, the lower annular column, and the upper annular column together form the receiving cavity. The lower end of the bearing abuts against the base. The side wall of the bearing near its lower end abuts against the inner wall of the lower annular column. The head end of the shaft extends through the lower end of the bearing into the groove. The upper annular column is spaced apart from the bearing to form an annular gap.

7. The rotating assembly according to claim 6, characterized in that, It also includes a pressure ring, which is sleeved on the upper end of the bearing and located in the annular gap.

8. The rotating assembly according to claim 7, characterized in that, The pressure ring includes a pressure plate and an annular retaining portion extending from the periphery of the pressure plate in a direction perpendicular to the pressure plate. The pressure plate is pressed onto the upper end face of the bearing. The annular retaining portion is inserted into the annular gap and spaced apart from the bearing. The side of the annular retaining portion away from the bearing abuts against the inner wall of the upper annular column. A through hole is provided in the middle of the pressure plate for the tail end of the shaft to pass through so that the tail end of the shaft extends to the outside of the receiving cavity.

9. The rotating assembly according to claim 6, characterized in that, It also includes a wear-resistant plate located within the receiving cavity, the wear-resistant plate being disposed on the groove wall of the groove relative to the opening, and the wear-resistant plate being in contact with the head end of the shaft.

10. A cooling fan, characterized in that, The device includes a housing, a plurality of fan blades, and a rotating assembly as described in any one of claims 1 to 9, wherein the rotating assembly and the plurality of fan blades are disposed within the housing, and the plurality of fan blades are mounted on the tail end of the central axis of the rotating assembly.

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