Fan and terminal equipment

Abstract

A fan comprises a motor and fan blades. The motor comprises a base, a rotating shaft, a bearing, a clamping ring and a shell. The rotating shaft comprises a first part and a second part which are mutually connected, and the first part is located in the base; the bearing is positioned in the base and surrounds the first part; the clamping ring surrounds the second part and the bearing, the bearing is fixed between the base and the clamping ring in the axial direction of the rotating shaft, and the clamping ring is fixed to the base and used for fixing the bearing and limiting the rotating shaft; the shell is fixedly connected with the second part and located on the side, away from the bearing, of the clamping ring. The fan blades are fixed to the shell and surround the shell. The invention further provides terminal equipment comprising the fan. The clamping ring plays a role in fixing the bearing and limiting the rotating shaft at the same time, other additional elements are reduced, in a limited installation space, the axial height of the bearing can be increased, the height of the bearing is increased, the strength of the bearing is improved, meanwhile, the limiting effect on the rotating shaft is improved, the reliability of the fan can be improved, and the service life of the fan can be prolonged.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology, and more particularly to a fan and a terminal device. Background Technology

[0002] Some electronic components in terminal devices generate heat during operation. To prevent overheating from affecting the device's performance and user experience, fans are typically used for air cooling. However, as terminal devices trend towards higher performance and thinner designs, the size of fans has decreased accordingly, which can easily reduce their reliability. Summary of the Invention

[0003] In a first aspect, embodiments of this application provide a fan that can improve reliability in order to solve the above-mentioned problems.

[0004] The fan includes a motor and fan blades; the motor includes a base, a rotating shaft, a bearing, a retaining ring, and a housing. The base has a receiving cavity; the rotating shaft includes a first part and a second part connected to each other, the first part having a first diameter R1, and the second part having a second diameter R2, the size relationship of R2 and R1 satisfying R2 < R1, the first part being located in the receiving cavity; the bearing is located in the receiving cavity and surrounds the first part; the retaining ring surrounds the second part and the bearing, the bearing being fixed between the base and the retaining ring along the axial direction of the rotating shaft, the retaining ring having an inner diameter D, the size relationship of R2, R1, and D satisfying R2 < D < R1, the retaining ring and the base being fixed; the housing and the second part are fixedly connected and located on the side of the retaining ring away from the bearing; the fan blades and the housing are fixed and surround the housing.

[0005] In the above embodiments, the retaining ring serves to both fix the rotating shaft and limit the bearing, eliminating the need for an additional retaining ring to limit the rotating shaft. In the limited installation space, the space used to install the retaining ring can be used to increase the axial height of the bearing. The increased bearing height enhances the bearing's strength, while also increasing the limiting effect on the rotating shaft, thereby improving the fan's reliability and extending its service life. Omitting the retaining ring reduces assembly steps during fan assembly, thus improving assembly efficiency.

[0006] In one possible implementation, the retaining ring includes a fixing portion and a limiting portion connected to each other. The fixing portion is located between the base and the bearing and abuts against the base radially along the rotation axis. The limiting portion extends radially toward the second portion and contacts the surface of the bearing. The end of the limiting portion away from the fixing portion is located between the housing and the first portion. The limiting portion is used to fix the bearing and limit the rotation axis axially.

[0007] In the above embodiments, the fixing part of the retaining ring is used to fix the retaining ring and the base, and the limiting part is used to fix the bearing along the axial direction and can limit the rotation shaft along the axial direction, which means that a retaining ring element has multiple functions at the same time.

[0008] In one possible implementation, the base further includes a first bottom wall and a first side wall, the receiving cavity includes a first mounting groove, the first bottom wall and the first side wall surround to form the first mounting groove, the fixing part is located in the first mounting groove, the fixing part abuts against the first side wall and has a gap between it and the first bottom wall along the axial direction.

[0009] In the above embodiment, there is an axial gap between the fixing part and the first bottom wall to ensure that the limiting part can contact the surface of the bearing during the assembly of the fan, so as to fix the bearing.

[0010] In one possible implementation, the fixing part is located between the first sidewall and the bearing, and there is a radial gap between the fixing part and the bearing.

[0011] In the above embodiments, there is a radial gap between the fixing part and the bearing, that is, the fixing part does not abut against the bearing, which can reduce the frictional force between the bearing and the first part of the rotating shaft; at the same time, it facilitates the assembly of the retaining ring onto the base.

[0012] In one possible implementation, the base further includes a second bottom wall and a second side wall, and the receiving cavity further includes a second mounting groove. The second bottom wall and the second side wall surround the second mounting groove, and the first mounting groove surrounds the second mounting groove. The bearing is located in the second mounting groove and is axially fixed between the second bottom wall and the limiting part.

[0013] In the above embodiment, the bearing is fixed axially between the second bottom wall and the limiting part, that is, the height between the limiting part and the second bottom wall is used to install the bearing, so that the height of the bearing can be maximized in a limited space.

[0014] In one possible implementation, the base includes a third bottom wall and a third side wall, and the receiving cavity also includes a third mounting groove, the third bottom wall and the third side wall surrounding to form the third mounting groove, and a second mounting groove surrounding the third mounting groove; the motor also includes a wear-resistant plate, the wear-resistant plate being located in the third mounting groove and between the third bottom wall and the first part.

[0015] In the above embodiment, a wear-resistant plate is installed between the third bottom wall and the first part. The wear-resistant plate can be used to reduce wear between the rotating shaft and the base.

[0016] In one possible implementation, the limiting part has a relief groove on the surface facing the bearing, and there is a gap between the surface facing the bearing and the first part.

[0017] In the above embodiment, a clearance groove is provided on the limiting part, and there is a gap between the surface of the limiting part facing the bearing and the first part, so that the rotating shaft can rotate smoothly relative to the retaining ring.

[0018] In one possible implementation, the housing has a through hole, and a portion of the surface of the limiting portion is exposed to the through hole.

[0019] In the above embodiments, the through hole allows external force to be applied to the limiting part of the retaining ring during the motor assembly process, so as to secure the retaining ring in the base.

[0020] In one possible implementation, the fan further includes a baffle, a coil, and a magnet, with the motor and fan blades housed in the baffle; the coil and the base are fixed to each other, and the magnet and the housing are fixed to each other.

[0021] In the above embodiments, the guide plate is used to direct the airflow generated by the fan in a specific direction; the fan blades can rotate under the combined action of the coil and the magnet.

[0022] Secondly, embodiments of this application provide a terminal device, including electronic components and a fan, wherein the fan is used to dissipate heat generated by the electronic components.

[0023] In the above embodiments, increasing the height of the bearing within a limited installation space can improve the reliability of the fan and extend its service life, thereby increasing the service life of the terminal device without increasing its size. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a terminal device provided in an embodiment of this application.

[0025] Figure 2 for Figure 1 The diagram shows a top view of the heat dissipation components in the terminal device.

[0026] Figure 3 This is a schematic diagram of the structure of a fan provided for other embodiments of this application.

[0027] Figure 4 for Figure 3 The exploded view of the fan shown.

[0028] Figure 5 for Figure 4 The diagram shows a planar cross-section of the motor in the fan along the AA direction.

[0029] Figure 6 This is a schematic diagram of the structure of a fan provided for other embodiments of this application.

[0030] Figure 7 for Figure 6 The exploded view of the fan shown.

[0031] Figure 8 for Figure 7 The image shows an exploded view of the motor in the fan.

[0032] Figure 9 for Figure 7 The diagram shows a planar cross-section of the motor in the fan along the BB direction.

[0033] Figure 10 for Figure 7 The diagram shows a three-dimensional cross-section of the motor in the fan along the BB direction.

[0034] Figure 11 This is a schematic cross-sectional view of a wear-resistant plate and a bearing being installed sequentially in a base, as provided in this embodiment.

[0035] Figure 12 In order to be in Figure 11 The diagram shows a planar cross-section of the base, which is equipped with a retaining ring, a rotating shaft, and a housing.

[0036] Figure 13 For crossing Figure 12 The diagram shows a planar cross-section of the housing with external force applied to the retaining ring to install the retaining ring and the rotating shaft.

[0037] Explanation of main component symbols

[0038]

[0039] Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of this application; the described embodiments are merely some, not all, of the embodiments described in this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes all and any combination of one or more of the associated listed items.

[0042] In the various embodiments of this application, for ease of description and not limitation, the term "connection" used in the patent application specification and claims is not limited to physical or mechanical connections, whether direct or indirect. Terms such as "upper," "lower," "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a terminal device 200 provided in an embodiment of this application.

[0044] Terminal device 200 can be a mobile terminal or a fixed terminal, including fan 100. Mobile terminals include, but are not limited to, tablets, laptops, wearable devices, smart bracelets, navigation devices, cameras, drones, and camcorders. Fixed terminals include, but are not limited to, large-screen TVs and desktop computers. Figure 1 In the embodiment shown, the terminal device 200 is a laptop computer.

[0045] The terminal device 200 also includes electronic components 226, including but not limited to chips, central processing units (CPUs), graphics processing units (GPUs), wireless modules, and batteries. During operation, the electronic components 226 generate heat. The fan 100 is used to dissipate this heat to prevent heat accumulation and a sharp increase in heat flux density, which could lead to overheating and affect the performance of the electronic components 226 and the user experience. Due to the slim and lightweight design of the terminal device 200, the space for installing the fan 100 is limited, and this reduction in size has a certain impact on the reliability of the fan 100.

[0046] Figure 1The terminal device 200 (notebook computer) shown may further include a first body 210 and a second body 220, which are rotatably connected. The terminal device 200 can be in an open or folded state. The first body 210 may include a first housing 212 and a display screen 214, with the first housing 212 located on one side of the display screen 214 and surrounding its edge. The second body 220 may include a second housing 222, a keyboard 224, electronic components 226, and a heat dissipation assembly 228, with the second housing 222 located on one side of the keyboard 224 and surrounding its edge. The heat dissipation assembly 228 and electronic components 226 are located between the second housing 222 and the keyboard 224. When the terminal device 200 is in a folded state, the display screen 214 and keyboard 224 are located on the inside, and the first housing 212 and second housing 222 are located on the outside.

[0047] Please see Figure 2 , Figure 2 for Figure 1 A schematic diagram of the heat dissipation component 228 in the terminal device 200 shown.

[0048] The heat dissipation assembly 228 may include a heat spreader 2281, fins 2283, and a fan 100. Electronic components 226 and fins 2283 are located on the surface of the heat spreader 2281. The heat spreader 2281 and electronic components 226 are connected (directly or indirectly). The heat spreader 2281 is used to quickly conduct heat generated by the electronic components 226 to reduce the surface temperature of the electronic components 226. The fins 2283 are located at the ends of the heat spreader 2281 away from the electronic components 226, and are used to increase the heat dissipation area. The fan 100 enables airflow within the terminal device 200, thereby quickly dissipating heat and preventing rapid heat accumulation in the terminal device 200, so that the electronic components 226 can be maintained at a suitable operating temperature. It is understood that in other embodiments, the heat spreader 2281 and heat dissipation fins 2283 may be omitted according to actual needs. The connection methods between the electronic components 226 and the heat spreader 2281 include, but are not limited to, bonding, screwing, and snap-fitting.

[0049] In the same terminal device 200, the number of electronic components 226 can be one or more. When there are multiple electronic components 226, they can share a single heat spreader 2281, or multiple heat spreaders 2281 can be set up. The specific number of electronic components 226 and heat spreaders 2281 is not limited and can be flexibly adjusted according to the hardware form, component layout, and usage scenario of the terminal device 200.

[0050] Please see Figure 3 , Figure 4 and Figure 5 , Figure 3This is a schematic diagram of the structure of the fan 100 provided in some embodiments of this application. Figure 4 for Figure 3 The exploded view of fan 100 shown is shown. Figure 5 for Figure 4 A schematic cross-sectional view of the motor 30 in the fan 100 along the AA direction.

[0051] Please see Figure 3 and Figure 4 The fan 100 may include a motor 30, fan blades 40, and a baffle 50. The fan blades 40 surround the motor 30, which drives the fan blades 40 to rotate. The motor 30 and fan blades 40 are located within the baffle 50, which includes an air inlet 51 and an air outlet 52, the air outlet 52 being oriented towards the fins 2283. When the fan 100 is operating, the motor 30 drives the fan blades 40 to rotate, generating airflow, which is then blown out from the air outlet 52 towards the fins 2283. The air inlet 51 allows air to flow into the fan 100 to replenish the air flowing out from the air outlet 52.

[0052] Please see Figure 5 The motor 30 may include a base 31, a rotating shaft 32, a bearing 33, a retaining ring 34, a snap ring 35, and a housing 36. The base 31, bearing 33, retaining ring 34, and snap ring 35 form a stator assembly (not shown), and the rotating shaft 32 and housing 36 form a rotor assembly (not shown). The rotor assembly is rotatable relative to the stator assembly. The fan blades 40 and housing 36 are relatively fixed and can rotate with the rotor assembly to dissipate heat.

[0053] The rotating shaft 32 is roughly cylindrical, and both the fan blade 40 and the housing 36 rotate around the axis of the rotating shaft 32. For ease of explanation, the direction parallel to the axis of the rotating shaft 32 is defined as axial direction L1, and the direction perpendicular to axial direction L1 is defined as radial direction L2.

[0054] Specifically, please refer to Figure 5The base 31 has a receiving cavity 317, which can be used to receive the rotating shaft 32, bearing 33, retaining ring 34, and snap ring 35. The base 31 includes a first bottom wall 311, a first side wall 312, a second bottom wall 313, a second side wall 314, a third bottom wall 315, and a third side wall 316, which together form the receiving cavity 317. The receiving cavity 317 may include a first mounting groove 3171, a second mounting groove 3172, and a third mounting groove 3173, with the first mounting groove 3171 surrounding the second mounting groove 3172, and the second mounting groove 3172 surrounding the third mounting groove 3173. The first bottom wall 311 and the first side wall 312 form a first mounting groove 3171, the second bottom wall 313 and the second side wall 314 form a second mounting groove 3172, and the third bottom wall 315 and the third side wall 316 form a third mounting groove 3173.

[0055] The first bottom wall 311, the second bottom wall 313, and the third bottom wall 315 are all parallel to the radial direction L2 and arranged along the axial direction L1, with the second bottom wall 313 located between the first bottom wall 311 and the third bottom wall 315. That is, the first bottom wall 311 is formed by a recess along the axial direction L1 from the surface of the base 31, the second bottom wall 313 is formed by a further recess along the axial direction L1 from the first bottom wall 311, and the third bottom wall 315 is formed by a further further recess along the axial direction L1 from the second bottom wall 313. The first side wall 312, the second side wall 314, and the third side wall 316 are all parallel to the axial direction L1 and arranged along the radial direction L2, with the second side wall 314 located between the first side wall 312 and the third side wall 316.

[0056] The rotating shaft 32 is located in the third mounting groove 3173 of the receiving cavity 317, and there is a gap between the rotating shaft 32 and the third side wall 316. The motor 30 may also include a wear-resistant plate 37, which is located in the third mounting groove 3173 of the receiving cavity 317 and between the third bottom wall 315 and the rotating shaft 32.

[0057] Both the retaining ring 34 and the bearing 33 are located in the second mounting groove 3172 of the receiving cavity 317 and surround the rotating shaft 32. The retaining ring 34 is located between the second bottom wall 313 and the bearing 33. The rotating shaft 32 can rotate relative to the bearing 33. The surface of the bearing 33 is usually provided with lubricating oil and contacts the surface of the rotating shaft 32 to provide lubrication. The bearing 33 also serves to limit the rotation of the rotating shaft 32 radially L2.

[0058] The rotating shaft 32 has an annular limiting groove 321, which is formed by a radial indentation L2 on the surface of the rotating shaft 32. The end of the retaining ring 34 away from the second sidewall 314 extends toward the limiting groove 321, and a portion of the retaining ring 34 extends into the limiting groove 321. The retaining ring 34 is used to limit the rotating shaft 32 along the axial direction L1 to prevent the rotating shaft 32 from falling off along the axial direction L1 during rotation.

[0059] The retaining ring 34 is made of plastic, such as polyvinyl chloride (PVT). During the assembly of the fan 100, when the rotating shaft 32 passes through the retaining ring 34, the retaining ring 34 deforms. After the rotating shaft 32 passes through the retaining ring 34, the retaining ring 34 returns to its original shape, so as to limit the rotating shaft 32 along the axis L1.

[0060] The retaining ring 35 includes a fixing part 351 and a limiting part 352 connected to each other. The cross-section of the retaining ring 35 along the axial direction L1 is approximately L-shaped. The fixing part 351 is located in the first mounting groove 3171 and surrounds the bearing 33. The fixing part 351 abuts against the first side wall 312, that is, the fixing part 351 and the first side wall 312 are interference-fitted, and the retaining ring 35 and the base 31 are fixed to each other. The limiting part 352 extends radially L2 toward the rotating shaft 32 relative to the fixing part 351 and contacts the surface of the bearing 33. The limiting part 352 is used to fix the bearing 33.

[0061] In this embodiment, the limiting part 352, the bearing 33, and the retaining ring 34 are arranged along the axial direction L1. The bearing 33 and the retaining ring 34 need to be arranged between the limiting part 352 and the second bottom wall 313. This is equivalent to reducing the height H1 of the bearing 33 along the axial direction L1 within a limited installation space. The reduced height H1 of the bearing 33 reduces its strength and weakens its limiting effect on the rotating shaft 32, which in turn reduces the reliability of the fan 100 and shortens its service life. Furthermore, due to the strength requirements and the coordination between the various components and other external components, it is difficult to increase the height H1 of the bearing 33 by reducing the wall thickness of the base 31 or changing the structure of the base 31.

[0062] Please see Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the fan 100a provided in some other embodiments of this application. Figure 7 for Figure 6 The exploded view of fan 100a shown.

[0063] In this embodiment, fan 100a is used to replace fan 100. Fan 100a can increase the height H2 of bearing 33 along axial L1 in a limited installation space, thereby improving the reliability of fan 100a and extending the service life of fan 100a.

[0064] Please see Figure 8 , Figure 9 and Figure 10 , Figure 8 for Figure 7 An exploded view of the motor 30a in the fan 100a shown. Figure 8 for Figure 7 The schematic diagram of the planar cross-section of the motor 30a in the fan 100a along the BB direction is shown. Figure 9 for Figure 7 A three-dimensional cross-sectional view of the motor 30a in the fan 100a along the BB direction.

[0065] The fan 100a may include a motor 30a, fan blades 40, and a guide plate 50. The fan blades 40 surround the motor 30a, and the motor 30a drives the fan blades 40 to rotate. The motor 30a and the fan blades 40 are located in the guide plate 50, which includes an air inlet 51 and an air outlet 52. The air outlet 52 is oriented towards the fins 2283. When the fan 100a is operating, the motor 30a drives the fan blades 40 to rotate, generating airflow, which is blown out from the air outlet 52 towards the fins 2283. The air inlet 51 allows air to flow into the fan 100a to replenish the air flowing out from the air outlet 52. It is understood that the number of air inlets 51 and air outlets 52 is not limited and can be set according to specific needs. For example, in this embodiment, there is one air inlet 51 and two air outlets 52, which are used to dissipate heat from different directions.

[0066] The motor 30a may include a base 31, a rotating shaft 32a, a bearing 33a, a retaining ring 35a, and a housing 36a. The base 31, bearing 33a, and retaining ring 35a form a stator assembly, while the rotating shaft 32a and housing 36a form a rotor assembly. The rotor assembly is rotatable relative to the stator assembly. The fan blades 40 and housing 36a are relatively fixed and can rotate with the rotor assembly to dissipate heat. Compared to the previous embodiment, the fan 100a in this embodiment omits the retaining ring 34, and the structures of the retaining ring 35a and rotating shaft 32a are adjusted accordingly.

[0067] The base 31 has a receiving cavity 317, which can be used to accommodate the rotating shaft 32a, the bearing 33a, and the retaining ring 35a. The base 31 includes a first bottom wall 311, a first side wall 312, a second bottom wall 313, a second side wall 314, a third bottom wall 315, and a third side wall 316, which together form the receiving cavity 317. The receiving cavity 317 may include a first mounting groove 3171, a second mounting groove 3172, and a third mounting groove 3173, with the first mounting groove 3171 surrounding the second mounting groove 3172, and the second mounting groove 3172 surrounding the third mounting groove 3173. The first bottom wall 311 and the first side wall 312 form a first mounting groove 3171, the second bottom wall 313 and the second side wall 314 form a second mounting groove 3172, and the third bottom wall 315 and the third side wall 316 form a third mounting groove 3173.

[0068] The first bottom wall 311, the second bottom wall 313, and the third bottom wall 315 are all parallel to the radial direction L2 and arranged along the axial direction L1, with the second bottom wall 313 located between the first bottom wall 311 and the third bottom wall 315. That is, the first bottom wall 311 is formed by a recess along the axial direction L1 from the surface of the base 31, the second bottom wall 313 is formed by a further recess along the axial direction L1 from the first bottom wall 311, and the third bottom wall 315 is formed by a further further recess along the axial direction L1 from the second bottom wall 313. The first side wall 312, the second side wall 314, and the third side wall 316 are all parallel to the axial direction L1 and arranged along the radial direction L2, with the second side wall 314 located between the first side wall 312 and the third side wall 316.

[0069] The rotating shaft 32a includes a first part 322a and a second part 323a connected to each other, and the first part 322a and the second part 323a are coaxially arranged. The first part 322a has a first diameter R1, and the second part 323a has a second diameter R2, the size relationship between R2 and R1 is R2 < R1. The first part 322a is located in the third mounting groove 3173 of the receiving cavity 317, and the second part 323a extends from the first part 322a in a direction away from the third bottom wall 315.

[0070] A gap exists between the first part 322a and the third sidewall 316. The motor 30a may also include a wear-resistant plate 37, located in the third mounting groove 3173 and between the third bottom wall 315 and the first part 322a, with a gap between the first part 322a and the third sidewall 316. The wear-resistant plate 37 is used to reduce wear between the rotating shaft 32a and the base 31. The second part 323a is fixedly connected to the housing 36a, and there is a gap along the axial direction L1 between the housing 36a and the first part 322a. The methods of fixing the second part 323a and the housing 36a include, but are not limited to, welding, riveting, snap-fitting, and threaded connection.

[0071] The bearing 33a is located in the second mounting groove 3172 of the receiving cavity 317 and surrounds the first part 322a. The bearing 33a is connected to the second bottom wall 313. The rotating shaft 32a is rotatable relative to the bearing 33a. The surface of the bearing 33a is usually provided with lubricating oil and contacts the surface of the first part 322a to provide lubrication. The bearing 33a also serves to limit the rotation of the rotating shaft 32a radially L2.

[0072] The retaining ring 35a includes a fixing part 351a and a limiting part 352a connected to each other. The cross-section of the retaining ring 35a along the axial direction L1 is approximately L-shaped. The fixing part 351a is located in the first mounting groove 3171 and surrounds the bearing 33a. The fixing part 351a abuts against the first side wall 312, that is, the fixing part 351a and the first side wall 312 are interference-fitted, and the retaining ring 35a and the base 31 are fixed to each other. The limiting part 352a extends radially L2 toward the second part 323a relative to the fixing part 351a and contacts the surface of the bearing 33a. The bearing 33a is fixed between the limiting part 352a and the second bottom wall 313. The end of the limiting part 352a away from the fixing part 351a is located between the housing 36a and the first part 322a. The limiting part 352a of the retaining ring 35a has an inner diameter D, and the relationship between R2, R1 and D satisfies R2 < D < R1. The limiting part 352a is used to fix the bearing 33a and limit the rotating shaft 32a along the axial direction L1.

[0073] When the fan 100 is not in operation, the limiting part 352a has a certain gap with the housing 36a and the first part 322a along the axial direction L1. During the operation of the fan 100, the rotating shaft 32a can move along the axial direction L1, and the limiting part 352a can limit the rotating shaft 32a along the axial direction L1 to prevent the rotating shaft 32a from falling off along the axial direction L1 during rotation. Compared with the previous embodiment, the retaining ring 35a in this embodiment has the functions of fixing the bearing 33a and limiting the rotating shaft 32a.

[0074] The retaining ring 35a can be made of hard materials such as metal or metal alloy, such as copper or stainless steel. Since the retaining ring 35a has the function of limiting the rotation of the rotating shaft 32a along the axial direction L1, compared with the retaining ring 34 which is made of plastic, the use of a hard material in this embodiment can improve the fatigue resistance of the retaining ring 35a and extend the service life of the fan 100a.

[0075] The fixing part 351a and the first bottom wall 311 have a gap along the axial direction L1 to ensure that the limiting part 352a can contact the surface of the bearing 33a during the assembly of the fan 100a, so as to fix the bearing 33a.

[0076] There is a radial distance L2 between the fixing part 351a and the bearing 33a, that is, the fixing part 351a does not abut against the bearing 33a, which can reduce the frictional force between the bearing 33a and the first part 321a of the rotating shaft 32a; at the same time, it facilitates the assembly of the retaining ring 35a onto the base 31.

[0077] The limiting part 352a has a relief groove 353a on its surface facing the bearing 33a. There is a gap between the limiting part 352a and the first part 322a so that the rotating shaft 32a can rotate smoothly relative to the retaining ring 35a.

[0078] Specifically, the limiting part 352a includes a first surface 3521a and a second surface 3522a, both of which are disposed facing the bearing 33a. The first surface 3521a is in surface contact with the bearing 33a, and the second surface 3522a is formed by a recess in the first surface 3521a in a direction away from the bearing 33a. The recessed space of the first surface 3521a forms a relief groove 353a. There is a gap between the second surface 3522a and the first part 3522a, and the second surface 3522a may further have a gap with the bearing 33a.

[0079] The housing 36a has at least one through hole 361a. In this embodiment, the housing 36a has four through holes 361a, which surround the rotating shaft 32a. Part of the surface of the limiting part 352a is exposed to the through holes 361a. During the assembly of the motor 30a, an external force is applied through the through holes 361a to the limiting part 352a of the retaining ring 35a, so as to secure the retaining ring 35a in the base 31.

[0080] The fan 100a may also include a coil 38 and a magnet 39. The coil 38 and the base 31 are fixed to each other, and the magnet 39 and the housing 36a are fixed to each other. When current passes through the coil 38, the coil 38 generates a magnetic field. The magnetic field generated by the coil 38 and the magnetic field generated by the magnet 39 interact. Since the coil 38 and the base 31 are fixed, the interacting magnetic field drives the magnet 39 and the housing 36a and fan blades 40, which are fixed relative to the magnet 39, to rotate, thereby generating airflow.

[0081] Please see Figure 11 , Figure 12 and Figure 13 The 30a motor can be assembled using the following steps:

[0082] Step S1: Please refer to Figure 11 Wear-resistant sheet 37 and bearing 33a are sequentially installed in the receiving cavity 317 of base 31.

[0083] The wear-resistant plate 37 is located in the third mounting groove 3173 and on the third bottom wall 315, and the bearing 33a is located in the second mounting groove 3172 and on the second bottom wall 313.

[0084] Step S2: Please refer to Figure 12 The retaining ring 35a, the rotating shaft 32a and the housing 36a are formed into a single assembly so that the retaining ring 35a, the rotating shaft 32a and the housing 36a can be installed simultaneously.

[0085] The retaining portion 352a of the retaining ring 35a is fitted onto the second portion 323a of the rotating shaft 32a, fixing the housing 36a and the second portion 323a of the rotating shaft 32a, so that the retaining ring 35a, the rotating shaft 32a, and the housing 36a form a single assembly before being assembled with the base 31. Since the housing 36a and the rotating shaft 32a need to rotate synchronously during the operation of the fan 100a, the reliability of the connection between the housing 36a and the rotating shaft 32a affects the stability of the fan 100a. Therefore, during the assembly of the motor 30a, the housing 36a and the rotating shaft 32a need to be pre-fixed to ensure the reliability of the connection between them.

[0086] Step S3: Please refer to Figure 13 After the retaining ring 35a, the rotating shaft 32a, and the housing 36a form an assembly, the first part 322a of the rotating shaft 32a is placed in the first mounting groove 3171, and the fixing part 351a of the retaining ring 35a is placed in the corresponding area of ​​the first mounting groove 3171. The limiting part 352a of the retaining ring 35a is located on the side of the bearing 33a away from the second bottom wall 313. An external force F is applied to the retaining ring 35a through the through hole 361a of the housing 36a. Under the action of the external force F, the retaining ring 35a moves along the axial direction L1. The surfaces of the limiting part 352a and the bearing 33a come into contact. The fixing part 351a is located between the first side wall 312 and the bearing 33a and abuts against the fixing part 351a, thereby realizing the fixed connection between the retaining ring 35a and the base 31, and fixing the bearing 33a and the limiting rotating shaft 32a.

[0087] The installation order of coil 38 and magnet 39 can be determined according to actual needs. They can be installed after the above components are assembled, or they can be installed during the assembly process.

[0088] Compared to fan 100, the fan 100a provided in this embodiment omits the retaining ring 34. In the limited installation space, the space used to install the retaining ring 34 can be used to increase the height H2 (H2 > H1) of the bearing 33a along the axial direction L1. The increased height H2 of the bearing 33a improves the strength of the bearing 33a and increases the limiting effect on the rotating shaft 32a, thereby improving the reliability of the fan 100a and extending its service life. Omitting the retaining ring 34 reduces the number of assembly steps during the assembly of the fan 100a, thereby improving assembly efficiency.

[0089] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A fan, characterized in that, include: Electric motor, including: The base has a receiving cavity; The rotating shaft includes a first part and a second part connected to each other. The first part has a first diameter R1 and the second part has a second diameter R2. The size relationship between R2 and R1 satisfies R2 < R1. The first part is located in the receiving cavity. The bearing is located in the receiving cavity and surrounds the first part; A retaining ring surrounds the second part and the bearing, the bearing being fixed axially between the base and the retaining ring along the rotation axis. The retaining ring has an inner diameter D, and the relationships between R2, R1, and D satisfy R2 < D < R1. The retaining ring and the base are fixed. The housing, and the second part are fixedly connected and located on the side of the retaining ring opposite to the bearing; and The fan blades are fixed to and surround the housing.

2. The fan according to claim 1, characterized in that, The retaining ring includes a fixing part and a limiting part connected to each other. The fixing part is located between the base and the bearing and abuts against the base radially along the rotation axis. The limiting part extends radially toward the second part and contacts the surface of the bearing. The end of the limiting part away from the fixing part is located between the housing and the first part. The limiting part is used to fix the bearing and limit the rotation axis along the axial direction.

3. The fan according to claim 2, characterized in that, The base also includes a first bottom wall and a first side wall. The receiving cavity includes a first mounting groove. The first bottom wall and the first side wall surround and form the first mounting groove. The fixing part is located in the first mounting groove. The fixing part abuts against the first side wall and has a gap between it and the first bottom wall along the axial direction.

4. The fan according to claim 3, characterized in that, The fixing part is located between the first sidewall and the bearing, and there is a gap between the fixing part and the bearing along the radial direction.

5. The fan according to any one of claims 3-4, characterized in that, The base also includes a second bottom wall and a second side wall, and the receiving cavity also includes a second mounting groove. The second bottom wall and the second side wall surround the second mounting groove, and the first mounting groove surrounds the second mounting groove. The bearing is located in the second mounting groove and is fixed along the axial direction between the second bottom wall and the limiting part.

6. The fan according to claim 5, characterized in that, The base includes a third bottom wall and a third side wall, and the receiving cavity also includes a third mounting groove. The third bottom wall and the third side wall surround the third mounting groove, and the second mounting groove surrounds the third mounting groove. The motor also includes a wear-resistant plate, which is located in the third mounting groove and between the third bottom wall and the first part.

7. The fan according to any one of claims 2-6, characterized in that, The limiting part has a relief groove on the surface facing the bearing, and there is a gap between the limiting part and the first part.

8. The fan according to any one of claims 2-7, characterized in that, The housing has a through hole, and a portion of the surface of the limiting part is exposed to the through hole.

9. The fan according to any one of claims 1-8, characterized in that, The fan also includes a guide plate, a coil, and a magnet, with the motor and the fan blades housed in the guide plate; the coil and the base are fixed to each other, and the magnet and the housing are fixed to each other.

10. A terminal device, characterized in that, include: Electronic components; as well as The fan according to any one of claims 1-9, the fan being used to dissipate heat generated by electronic components.

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