Fan assembly

Abstract

The utility model provides a fan assembly, and relates to the technical field of fans. The fan assembly comprises a shell, the shell comprises a heat dissipation cavity, an air inlet and an air outlet which are communicated with the heat dissipation cavity are formed in the shell, an impeller is rotationally arranged in the heat dissipation cavity, an air guide channel and a plurality of heat dissipation ribs are further arranged in the heat dissipation cavity, and the heat dissipation ribs are distributed on the periphery of the impeller and extend to the air outlet. At least part of the air guide channel is defined by the side walls of the heat dissipation ribs, and the heat dissipation ribs can exchange heat with gas in the heat dissipation cavity and guide the gas to be exhausted from the air outlet along the air guide channel. According to the fan assembly, the heat dissipation ribs are additionally arranged, so that the surface area of the inner wall of the shell is increased, namely, the heat dissipation area is increased, the convective heat transfer coefficient of the surface is increased, and the heat dissipation effect is improved; and the air guide channel is defined by the radiating ribs, so that air can be guided to be quickly discharged from the air outlet along the air guide channel, and the air flow rate is increased.

Description

Technical Field

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

[0002] Most fans on the market today experience motor temperatures that rise significantly when running at high speeds, especially in high-temperature environments. This can easily lead to motor burnout and reduced reliability. Existing technologies typically rely solely on the motor's own materials and structure for heat dissipation, resulting in poor heat dissipation efficiency. Utility Model Content

[0003] An embodiment of the present application provides a fan assembly for solving the problem of poor heat dissipation efficiency.

[0004] In some embodiments, a fan assembly is provided, including a shell, the shell including a heat dissipation cavity, an air inlet and an air outlet connected to the heat dissipation cavity are opened on the shell, an impeller is rotated in the heat dissipation cavity, an air guide channel and a plurality of heat dissipation ribs are also provided in the heat dissipation cavity, the plurality of heat dissipation ribs are distributed around the impeller and extend to the air outlet, at least part of the air guide channel is defined by the side walls of each heat dissipation rib, each heat dissipation rib can exchange heat with the gas in the heat dissipation cavity and guide the gas to be discharged from the air outlet along the air guide channel.

[0005] In some embodiments, each of the heat dissipation ribs is in the shape of an elongated strip, and the air guide duct is formed on both sides of each of the heat dissipation ribs in the width direction thereof. Any heat dissipation rib and the adjacent heat dissipation ribs in its own length direction are sequentially connected and fitted to form a spiral distribution trajectory.

[0006] In some embodiments, the shell includes a first partial shell and a second partial shell, the first partial shell and the second partial shell enclose the heat dissipation cavity, the side of the second partial shell facing away from the heat dissipation cavity can be in contact with the heating device, the second partial shell is made of heat-conductive material, and multiple heat dissipation ribs are provided on the second partial shell.

[0007] In some embodiments, the second subshell includes an air guide surface, which is located on the side of the second subshell facing the air inlet. The air guide surface includes a first end and a second end, the first end is adjacent to the impeller, and the second end is located at the air outlet. The distance from the first end to the impeller along the axial direction of the impeller is smaller than the distance from the second end to the impeller along the axial direction of the impeller, and the first end is smoothly connected to the second end.

[0008] In some embodiments, each of the heat dissipation ribs is provided on the air guide surface and each of the heat dissipation ribs is spaced apart along the air guide surface from the first end to the second end.

[0009] In some embodiments, the spiral direction of the air guide surface is the same as the rotation direction of the impeller.

[0010] In some embodiments, each of the heat dissipation ribs is provided on the inner ring side wall of the second sub-shell, the heat dissipation ribs are distributed at intervals, and the distribution trajectory of each of the heat dissipation ribs extends along the axial spiral of the impeller to the air outlet.

[0011] In some embodiments, the impeller is a turbofan, the air inlet is parallel to the axial direction of the impeller, and the air outlet is perpendicular to the axial direction of the impeller.

[0012] In some embodiments, the fan assembly further includes a motor, the motor is in contact with a side of the second sub-shell facing away from the heat dissipation cavity, and an output shaft of the motor is connected to the impeller to drive the impeller to rotate.

[0013] In some embodiments, the motor includes a circuit board, a stator part, and a rotor part, the circuit board is in contact with the housing; the stator part is connected to the circuit board; the rotor part is rotatably connected to the stator part through a bearing, and the rotor part is connected to the impeller.

[0014] In some embodiments, the rotor portion includes an inner rotor, which is inserted into the stator portion and rotatably connected to the stator portion via a bearing, and one end of the inner rotor is connected to the impeller.

[0015] In some embodiments, the rotor portion further includes an outer rotor, the outer rotor cover being disposed on an outer periphery of the stator portion, and the outer rotor being connected to an end of the inner rotor away from the impeller.

[0016] In some embodiments, the outer rotor includes a plurality of blades, one end of each blade is connected to the inner rotor and extends radially, and the projection of each blade on its rotation plane is a straight line;

[0017] or the projection of each blade on its rotation plane is in an arc shape;

[0018] or an angle is formed between each of the blades and its rotation plane;

[0019] The rotation plane is a reference plane perpendicular to the axial direction of the rotor part.

[0020] In some embodiments, the housing further includes a third partial shell, which is connected to a side of the second partial shell facing away from the first partial shell and encloses the second partial shell to form a receiving cavity. A vent is provided on the third partial shell.

[0021] In the fan assembly provided in the embodiments of the present application, external air can enter the heat dissipation cavity through the air inlet to exchange heat with the housing, and then be discharged from the air outlet along the air guide channel, thereby removing the heat from the heat dissipation cavity. By providing additional heat dissipation ribs, the surface area of the inner wall of the housing is increased, that is, the heat dissipation area is increased. The heat dissipation ribs can increase airflow disturbance, increase the surface convective heat transfer coefficient, and enhance the heat dissipation effect. In addition, the air guide channel defined by the heat dissipation ribs can guide the air along the air guide channel to quickly discharge from the air outlet, increasing the gas flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 is a schematic diagram of the overall structure of a fan assembly in some embodiments of the present application;

[0024] Figure 2 yes Figure 1 An exploded schematic diagram of a fan assembly in an embodiment;

[0025] Figure 3 yes Figure 1 A cross-sectional schematic diagram of a fan assembly in an embodiment;

[0026] Figure 4 yes Figure 1 A schematic structural diagram of an impeller in an embodiment;

[0027] Figure 5 yes Figure 1 Schematic diagram of the positional relationship between the impeller and the second sub-shell in the embodiment;

[0028] Figure 6 yes Figure 1 A top view of the second partial shell in the embodiment;

[0029] Figure 7 yes Figure 1 A schematic diagram of a partial structure of a motor in an embodiment;

[0030] Figure 8 is a schematic diagram of a partial structure of a motor in another embodiment;

[0031] Figure 9 It is a schematic diagram of the partial structure of a motor in another embodiment.

[0032] In the above drawings:

[0033] 10. Housing; 11. Heat dissipation cavity; 12. Accommodation cavity; 13. First sub-shell; 131. Positioning flange; 14. Second sub-shell; 141. Air guide surface; 1411. First end; 1412. Second end; 142. Inner bottom wall; 143. Inner ring side wall; 15. Third sub-shell; 16. Air inlet; 17. Air outlet; 18. Ventilation port; 19. Air guide channel;

[0034] 20. Impeller; 21. First component; 22. Second component; 23. Blade portion;

[0035] 30. Motor; 31. Circuit board; 32. Stator; 33. Rotor; 331. Inner rotor; 332. Outer rotor; 3321. Blades; 34. Bearing seat; 35. Bearing;

[0036] 40. Heat dissipation ribs. DETAILED DESCRIPTION

[0037] The present application will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only intended to illustrate the present application and are not intended to limit the scope of the present application. Similarly, the following examples are only some examples of the present application and not all examples. All other examples obtained by those of ordinary skill in the art without creative work are intended to fall within the scope of protection of this application.

[0038] The terms "first", "second" and "third" in the embodiments of the present application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second" and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, "multiple" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of the present application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products or devices.

[0039] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] See also Figures 1 to 3 , Figure 1 is a schematic diagram of the overall structure of the fan assembly in some embodiments of the present application, Figure 2 yes Figure 1 An exploded schematic diagram of a fan assembly in the embodiment, Figure 3 yes Figure 1 A schematic cross-sectional view of a fan assembly in an embodiment.

[0041] An embodiment of the present application provides a fan assembly, including a shell 10, which includes a heat dissipation cavity 11. The shell 10 is provided with an air inlet 16 and an air outlet 17 connected to the heat dissipation cavity 11. An impeller 20 is rotated in the heat dissipation cavity 11. The heat dissipation cavity 11 is also provided with an air guide channel 19 and a plurality of heat dissipation ribs 40. The plurality of heat dissipation ribs 40 are distributed around the impeller 20 and extend to the air outlet 17. At least part of the air guide channel 19 is defined by the side walls of each heat dissipation rib 40. Each heat dissipation rib 40 can exchange heat with the gas in the heat dissipation cavity 11 and guide the gas to be discharged from the air outlet 17 along the air guide channel 19.

[0042] In this embodiment, the addition of heat dissipation ribs 40 increases the surface area of the inner wall of the housing 10, thereby increasing the heat dissipation area. Simultaneously, the heat dissipation ribs 40 enhance airflow disturbance, increasing the surface's convective heat transfer coefficient and improving heat dissipation. Furthermore, the air guide duct 19 defined by the heat dissipation ribs 40 guides air along the air guide duct 19 and rapidly discharges it from the air outlet 17, increasing the air flow rate.

[0043] See also Figure 2 Specifically, the heat dissipation rib 40 can be a hemispherical structure, a long strip structure or other special-shaped structure protruding from the inner wall of the shell 10. For example, the heat dissipation rib 40 is in the shape of a long strip, and any heat dissipation rib 40 and the heat dissipation rib 40 adjacent to it in the length direction are sequentially connected and fitted to form a roughly spiral distribution trajectory. Any heat dissipation rib 40 forms an air guide channel 19 on both sides of its own width direction. It can be understood that the air guide channel 19 includes the gap formed between the heat dissipation rib 40 and the inner wall of the shell 10 and the gap formed between each heat dissipation rib 40, that is, the air guide channel 19 can be jointly defined by the side walls of the heat dissipation rib 40 and the inner wall of the shell 10. The extension direction of the air guide channel 19 is consistent with the distribution trajectory of the heat dissipation rib 40.

[0044] In some embodiments, the fan assembly further includes a motor 30, which is in contact with the housing 10, and the output shaft of the motor 30 is connected to the impeller 20 to drive the impeller 20 to rotate. By contacting the motor 30 with the housing 10, the heat of the motor 30 can be transferred to the housing 10, and the external air can enter the heat dissipation cavity 11 through the air inlet 16 to exchange heat with the housing 10, and be discharged from the air outlet 17 along the heat dissipation ribs 40, thereby taking away the heat in the heat dissipation cavity 11. It should be noted that only part of the motor 30 is located in the heat dissipation cavity 11 to achieve a transmission connection with the impeller 20, and the various electronic components in the motor 30 are all installed outside the heat dissipation cavity 11. This can prevent dust and other impurities from entering the heat dissipation cavity 11 along with the gas during the rotation of the impeller 20 to affect the working performance of the motor 30 and reduce the loss of the motor 30.

[0045] See also Figure 2 as well as Figure 3 In some embodiments, the housing 10 includes a first sub-shell 13 and a second sub-shell 14. The first sub-shell 13 and the second sub-shell 14 enclose a heat dissipation cavity 11. A portion of the motor 30 is mounted on the side of the second sub-shell 14 facing away from the impeller 20 and in contact with the second sub-shell 14. The second sub-shell 14 acts as a heat transfer element in contact with the motor 30 and can quickly absorb heat from the motor 30. The second sub-shell 14 is made of a heat-conducting material, which can specifically be an aluminum alloy, alumina ceramic, or other material with a high heat transfer coefficient. A plurality of heat dissipation ribs 40 are provided on the second sub-shell 14. The heat dissipation ribs 40 are integrally formed with the second sub-shell 14. In other words, the heat dissipation ribs 40 are also made of a heat-conducting material. This can increase the volume and surface area of the heat conductor, improve the heat transfer rate between the heat conductor and the motor 30, and the heat exchange rate with the gas, thereby improving the heat dissipation efficiency of the motor 30.

[0046] In some embodiments, the housing 10 further includes a third sub-shell 15. The third sub-shell 15 is connected to the side of the second sub-shell 14 facing away from the first sub-shell 13 and, together with the second sub-shell 14, forms a housing 12 for mounting the motor 30. The third sub-shell 15 is positioned over the exterior of the motor 30 to protect it and maintain the integrity and aesthetics of the fan assembly. The first sub-shell 13, the second sub-shell 14, and the third sub-shell 15 are detachably fixedly connected, specifically by bolts, snap-fit connections, or the like.

[0047] See also Figure 4 , Figure 4 yes Figure 1 Schematic diagram of the structure of the impeller in the embodiment. In some embodiments, the impeller 20 is a turbo fan that sucks air in from the axial end side and sends it out radially outward. Specifically, Figure 4The direction in which the rotation center C of the impeller 20 extends is called the axial direction, the direction perpendicular to and away from the rotation center C is called the radial direction, and the direction perpendicular to and around the rotation center C is called the circumferential direction.

[0048] The impeller 20 includes a first component 21 and a second component 22 arranged axially opposite each other, and a plurality of blades 23 disposed between the first component 21 and the second component 22. The first component 21 is in the shape of a flat plate perpendicular to the axial direction and is connected to the output shaft of the motor 30. The second component 22 extends at an angle relative to the radial direction of the impeller 20 and is shaped like a trumpet with an outer diameter that gradually narrows away from the first component 21. The end of the second component 22 closest to the second component 22 is parallel to the second component 22, while the end of the second component 22 away from the first component 21 is parallel to the axial direction. The shape of the second component 22 is not limited to this and may also be parallel to the radial direction of the impeller 20.

[0049] See also Figure 3 Furthermore, the air inlet 16 is parallel to the axial direction of the impeller 20, while the air outlet 17 is perpendicular to the axial direction of the impeller 20. The air inlet 16 is provided at the end of the first sub-shell 13, and the air outlet 17 is provided around the first and second sub-shells 13, 14. The first sub-shell 13 is provided with a positioning flange 131 at the air inlet 16. The end of the second component 22, which is away from the first component 21, is sleeved around the outer periphery of the positioning flange 131 and rotates around the positioning flange 131.

[0050] See also Figure 5 as well as Figure 6 , Figure 5 Yes Figure 1 Schematic diagram of the positional relationship between the impeller and the second sub-shell in the embodiment, Figure 6 yes Figure 1A top view of the second sub-shell in an embodiment. In some embodiments, a gap is formed between the inner bottom wall 142 of the second sub-shell 14 and the impeller 20 to facilitate gas flow and avoid contact with the impeller 20, thereby interfering with the rotation of the impeller 20. The second sub-shell 14 includes an air guide surface 141. The air guide surface 141 is located on the side of the second sub-shell 14 facing the air inlet 16, that is, the air guide surface 141 is formed on the inner bottom wall 142 of the second sub-shell 14. The air guide surface 141 is an arcuate surface and includes a first end 1411 and a second end 1412. The first end 1411 is close to the first component 21 of the impeller 20, and the second end 1412 is located at the air outlet 17. The distance from the first end 1411 to the impeller 20 along the axial direction of the impeller 20 is shorter than the distance from the second end 1412 to the impeller 20 along the axial direction of the impeller 20. The first end 1411 and the second end 1412 are smoothly connected. The air guide surface 141 guides the flow of gas, reducing air flow resistance. Specifically, the air guide surface 141 spirally extends from a first end 1411 along the axial direction of the impeller 20 to a second end 1412. The radially inner edge of the air guide surface 141 is adjacent to the outer circumference of the impeller 20. It is understood that the projection of the air guide surface 141 on a first plane is generally annular, and the projection of the impeller 20 on the first plane is located within the inner annular range of the projection of the air guide surface 141 on the first plane. Because the impeller 20 is a turbofan that draws air in from one axial side and radially outward, positioning the radially inner edge of the air guide surface 141 adjacent to the outer circumference of the impeller 20 allows air to be discharged from the air outlet 17 along the air guide surface 141 after being discharged outward along the blade portion 23. This prevents step-like flow and reduces air flow resistance. Furthermore, the curved shape of the air guide surface 141 increases the area of the inner bottom wall 142 of the second sub-shell 14, thereby increasing the heat dissipation area and improving heat dissipation efficiency.

[0051] Furthermore, each heat dissipation rib 40 is provided on the air guide surface 141 and is spaced apart along the air guide surface 141 from the first end 1411 to the second end 1412. In view of the embodiment in which each heat dissipation rib 40 is in the form of an elongated strip, adjacent heat dissipation ribs 40 in the longitudinal direction of each heat dissipation rib 40 are sequentially connected and fitted to form a spiral shape that extends in the same direction as the air guide surface 141.

[0052] Furthermore, if Figure 1 As shown, the R direction is the rotation direction of the impeller 20, and the spiral direction of the air guide surface 141 is the same as the rotation direction of the impeller 20, which reduces the gas flow resistance to ensure the smoothness of the gas flow.

[0053] Please refer again Figure 3 In some embodiments, each heat dissipation rib 40 is provided on the inner ring side wall 143 of the second sub-shell 14 , and each heat dissipation rib 40 is distributed at intervals and the distribution trajectory of each heat dissipation rib 40 extends along the axial spiral of the impeller 20 to the air outlet 17 .

[0054] In some embodiments, the heat dissipation ribs 40 are disposed on the air guide surface 141 and the inner sidewall 143 of the second sub-shell 14. This can further increase the heat dissipation area and improve the heat dissipation efficiency.

[0055] In some embodiments, the inner bottom wall 142 of the second sub-shell 14 is a flat surface, perpendicular to the axial direction of the impeller 20 , and the heat dissipation ribs 40 are distributed on the inner bottom wall 142 of the second sub-shell 14 .

[0056] See also Figure 2 as well as Figure 3 In some embodiments, the motor 30 includes a circuit board 31, a stator 32, and a rotor 33. The circuit board 31 contacts the housing 10; the stator 32 is connected to the circuit board 31; and the rotor 33 is rotatably connected to the stator 32 via a bearing 35. The rotor 33 is also connected to the impeller 20. The circuit board 31 and the stator 32 are disposed within the accommodating cavity 12. Multiple electronic components are integrated on the circuit board 31. The circuit board 31 is closely attached to the side of the second sub-housing 14 facing away from the heat dissipation cavity 11 to facilitate heat transfer from the motor 30 to the second sub-housing 14 during operation.

[0057] The stator portion 32 is made of a magnetic material. Specifically, it can be formed by laminating silicon steel sheets. Silicon steel sheets have advantages such as high magnetic permeability, low hysteresis loss, and low coercive force, which can reduce energy loss and improve the efficiency of the motor 30. A bearing seat 34 is fixedly connected to the stator portion 32. A bearing 35 is disposed within the bearing seat 34 and can rotate relative to the bearing seat 34. Magnets (not shown) are embedded in the rotor portion 33. The magnetic torque generated by the magnetic force of the magnets causes the rotor portion 33 to rotate.

[0058] See also Figure 3 In some embodiments, the rotor portion 33 includes an inner rotor 331, which is disposed through the stator portion 32 and is rotatably connected to the stator portion 32 via a bearing 35. One end of the inner rotor 331 is connected to the impeller 20, which can be specifically connected by a key or fixed by an interlocking mechanism, as long as the inner rotor 331 and the impeller 20 do not rotate relative to each other.

[0059] In some embodiments, the rotor portion 33 further includes an outer rotor 332, which is disposed around the outer periphery of the stator portion 32 and is fixedly connected to an end of the inner rotor 331 away from the impeller 20. The outer rotor 332 is cylindrical and rotates synchronously with the inner rotor 331.

[0060] See 7, Figure 7 yes Figure 1A schematic diagram of a partial structure of the motor 30 in an embodiment. Furthermore, the outer rotor 332 includes multiple blades 3321, each of which is connected to the inner rotor 331 at one end and extends radially. The number of blades 3321 can be three, four, or other numbers, and is not specifically limited here. The multiple blades 3321 are arranged in an array along the circumference of the inner rotor 331, allowing heat from the motor 30 to be dissipated through the gaps between the blades 3321.

[0061] Please continue reading Figure 7 Optionally, the projection of each blade 3321 on its rotation plane is linear, that is, each blade 3321 extends linearly outward along the radial direction of the inner rotor 331.

[0062] See also Figure 8 , Figure 8 3 is a partial structural diagram of another embodiment of the motor 30. Optionally, the projection of each blade 3321 on its rotation plane is arc-shaped, that is, each blade 3321 extends outward in an arc along the radial direction of the inner rotor 331, that is, each blade 3321 is connected to the inner rotor 331 to form a centrifugal fan.

[0063] See also Figure 9 , Figure 9 3 is a partial structural diagram of another embodiment of the motor 30. Optionally, each blade 3321 forms an angle with its rotation plane, and the rotation plane is perpendicular to the axial direction of the rotor portion 33. In other words, each blade 3321 is connected to the inner rotor 331 to form an axial flow fan.

[0064] By providing the blades 3321 , the blades 3321 can rotate and drive the gas in the accommodating chamber 12 to flow, thereby dissipating heat for the motor 30 .

[0065] Please refer again Figure 2 Furthermore, a vent 18 is provided on the third subshell 15 so that the gas in the accommodating cavity 12 can be discharged from the vent 18 . The vent 18 is distributed on the end side and / or the ring side of the third subshell 15 .

[0066] The above descriptions are only some embodiments of the present application and do not limit the scope of protection of the present application. Any equivalent device or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of this application.

Claims

1. A fan assembly, characterized in that: The heat dissipation device comprises a shell, which comprises a heat dissipation cavity. An air inlet and an air outlet connected to the heat dissipation cavity are provided on the shell. An impeller is provided for rotation in the heat dissipation cavity. An air guide channel and a plurality of heat dissipation ribs are also provided in the heat dissipation cavity. The plurality of heat dissipation ribs are distributed around the impeller and extend to the air outlet. At least part of the air guide channel is defined by the side walls of each heat dissipation rib. Each heat dissipation rib can exchange heat with the gas in the heat dissipation cavity and guide the gas to be discharged from the air outlet along the air guide channel.

2. The fan assembly according to claim 1, characterized in that Each of the heat dissipation ribs is in the shape of an elongated strip, and the air guide channel is formed on both sides of each of the heat dissipation ribs in the width direction thereof. Any heat dissipation rib and the adjacent heat dissipation ribs in its own length direction are sequentially connected and fitted to form a spiral distribution trajectory.

3. The fan assembly according to claim 1 or 2, characterized in that: The shell includes a first partial shell and a second partial shell. The first partial shell and the second partial shell enclose the heat dissipation cavity. The side of the second partial shell facing away from the heat dissipation cavity can be in contact with the heating device. The second partial shell is made of a heat-conducting material. Multiple heat dissipation ribs are provided on the second partial shell.

4. The fan assembly according to claim 3, characterized in that: The second partial shell includes an air guide surface, which is located on the side of the second partial shell facing the air inlet. The air guide surface includes a first end and a second end. The first end is adjacent to the impeller, and the second end is located at the air outlet. The distance from the first end to the impeller along the axial direction of the impeller is smaller than the distance from the second end to the impeller along the axial direction of the impeller. The first end is smoothly connected to the second end.

5. The fan assembly according to claim 4, characterized in that: Each of the heat dissipation ribs is provided on the air guide surface and is spaced apart along the air guide surface from the first end to the second end.

6. The fan assembly according to claim 3, characterized in that: Each of the heat dissipation ribs is arranged on the inner ring side wall of the second sub-shell, the heat dissipation ribs are distributed at intervals, and the distribution trajectory of each of the heat dissipation ribs spirally extends along the axial direction of the impeller to the air outlet.

7. The fan assembly according to claim 3, characterized in that: The impeller is a turbo fan, the air inlet is parallel to the axial direction of the impeller, and the air outlet is perpendicular to the axial direction of the impeller.

8. The fan assembly according to claim 3, characterized in that: The fan assembly further includes a motor, which contacts a side of the second sub-shell facing away from the heat dissipation cavity, and an output shaft of the motor is connected to the impeller to drive the impeller to rotate.

9. The fan assembly according to claim 8, characterized in that: The motor comprises: a circuit board, the circuit board being in contact with the second partial shell; a stator portion connected to the circuit board; A rotor portion is rotatably connected to the stator portion via a bearing, and the rotor portion is connected to the impeller.

10. The fan assembly according to claim 9, characterized in that: The rotor portion includes an inner rotor, which is inserted into the stator portion and rotatably connected to the stator portion via a bearing. One end of the inner rotor is connected to the impeller.

11. The fan assembly according to claim 10, characterized in that: The rotor part further includes an outer rotor. The outer rotor is covered on the outer periphery of the stator part and is connected to an end of the inner rotor away from the impeller.

12. The fan assembly according to claim 11, characterized in that The outer rotor includes a plurality of blades, one end of each blade is connected to the inner rotor and extends radially, and the projection of each blade on its rotation plane is a straight line; or the projection of each blade on its rotation plane is in an arc shape; or an angle is formed between each of the blades and its rotation plane; The rotation plane is a reference plane perpendicular to the axial direction of the rotor part.

13. The fan assembly according to claim 8, characterized in that The housing further includes a third partial shell, which is connected to a side of the second partial shell facing away from the first partial shell and encloses the second partial shell to form a receiving cavity. A vent is provided on the third partial shell.

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