Motor rotor assembly, motor and cooling fan

Abstract

The present application discloses a motor rotor assembly, a motor, and a cooling fan, wherein the motor rotor assembly includes: a top plate; a ring wall vertically arranged around the periphery of the top plate; a stator chamber formed by the top plate and the ring wall and opening downward; a rotating shaft, one end of which is vertically fixed to the middle position of the inner surface of the top plate and cantilevered downward; a plurality of guide vanes protruding from the inner surface of the top plate, each of the guide vanes radiating outward from the center of the rotating shaft on the inner surface of the top plate to the inner wall surface of the ring wall; an opening formed through the ring wall, and forming an inlet and an outlet on the inner wall surface and the outer wall surface of the ring wall respectively; one side of each guide vane is provided with the opening, and the inlet is close to the side surface of the guide vane. The above scheme is conducive to discharging heat from the inside of the motor housing and is conducive to controlling noise and turbulence.

Description

Technical Field

[0001] The present application relates to a motor rotor assembly, a motor and a cooling fan. Background Art

[0002] For prior art, please refer to Chinese utility model patent CN212360261U, which discloses a cooling fan that performs internal heat dissipation through fan blades and motor housing through-holes, including: a fan frame, fan blades, a motor, and a PCB board; the fan frame is provided with a fan base, a support arm, and a wire harness support arm, and the fan base is fixedly connected to the fan frame through the support arm and the wire harness support arm, and a motor fixing seat is provided on the fan base; the fan blades are provided with a central heat dissipation opening and a fan blade heat dissipation through-hole, and the central heat dissipation opening is located at the center of the fan blade; the motor is provided with a riveted motor housing, a magnetic strip, a first bearing, a fixed middle tube, an embossed iron core, and a second bearing, and the riveted motor housing is provided with a motor rivet shaft core and a motor housing heat dissipation through-hole, and the position of the motor housing heat dissipation through-hole corresponds to the fan blade heat dissipation through-hole; the embossed iron core is composed of a winding combination winding bracket, and the embossed iron core is provided with an embossed iron core fixing hole and a metal guide column; the prior art aims to solve the problems and shortcomings of how to dissipate heat inside the motor and improve its service life.

[0003] However, the fan blade heat dissipation through hole and the motor housing heat dissipation through hole in the prior art (CN212360261U) are both arranged at the center of the fan blade, that is, on the top plate of the motor housing. Figure 2 When the fan blades rotate at high speed (counterclockwise), they drive the airflow downward. Some of this airflow flows inward through the fan blade heat dissipation holes and the motor housing heat dissipation holes, dissipating heat from the stator components and circuit boards inside the motor housing. However, due to the high-speed rotation of the fan blades, this structure creates an angle between the inner walls of the fan blade heat dissipation holes and the air flowing downward. This creates noise and turbulence, and actually hinders the smooth flow of air from top to bottom through the fan blade heat dissipation holes and the motor housing heat dissipation holes into the motor housing.

[0004] For example, the prior art patent CN101498320B discloses a fan and its impeller, wherein the fan includes a fan frame and a motor, which is arranged on the fan frame. The motor is connected to an impeller and drives the impeller, wherein the impeller includes a hub with an opening at the top; a plurality of fan blades, which are arranged in a ring around the hub; and an exhaust structure, which is arranged in the opening of the hub to discharge the hot air generated by the motor out of the hub.

[0005] In the prior art (CN101498320B), the connection piece 222 of the exhaust structure 22 is opposite to the tilt or curvature direction of the fan blades. When the motor 20 of the fan 2 drives the impeller 215 to rotate, the exhaust structure 22 is connected to the impeller 215, and the connection piece 222 also rotates with the impeller 215. Therefore, the heat generated by the motor 20 can be discharged from the inside to the outside through the magnetic shell 213 with a hollow shell structure and the exhaust structure 22, and will not accumulate inside the magnetic shell 213. The direction of heat dissipation is the same as that of the prior art. Figure 3 This will cause the airflow driving direction between the fan used for actual wind driving and the exhaust structure 22 for heat dissipation to be opposite, for details, please refer to the prior art Figure 3 In the embodiment, the fan blades drive the airflow downwards, and the exhaust structure 22 drives the airflow upwards, which will cause serious air turbulence effect, affect the actual wind-driving performance of the fan (affect the wind-driving performance of the fan blades), and also produce greater noise.

[0006] Therefore, it is necessary to design a new motor rotor assembly, motor and cooling fan to solve the above technical problems. Summary of the Invention

[0007] The purpose of this application is to provide a new motor rotor assembly, motor and cooling fan, which are conducive to discharging heat inside the motor housing and controlling noise and turbulence.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A motor rotor assembly, comprising:

[0010] roof;

[0011] A ring wall is vertically arranged around the periphery of the top plate;

[0012] The stator chamber is formed by the top plate and the ring wall and is open downward;

[0013] A rotating shaft, one end of which is vertically fixed to the middle position of the inner surface of the top plate and cantilevered downward;

[0014] A plurality of guide vanes are formed by protruding from the inner surface of the top plate, and each of the guide vanes extends outward from the center of the rotating shaft on the inner surface of the top plate;

[0015] An opening is formed through the annular wall, and an inlet and an outlet are formed on the inner wall surface and the outer wall surface of the annular wall respectively;

[0016] The plurality of guide vanes can drive the airflow inside the stator chamber to flow from the inlet into the opening and out from the outlet.

[0017] Furthermore, each of the guide blades radiates outward from the center of the rotating shaft on the inner surface of the top plate to the inner wall surface of the ring wall, and one side of each of the guide blades is provided with the opening, and the inlet is close to one side surface of the guide blade.

[0018] Furthermore, the guide vane is perpendicular to the inner surface of the top plate along the axial direction of the rotating shaft.

[0019] Furthermore, each of the guide blades is defined with a windward surface and a leeward surface along the circumferential direction of the annular wall, and the inlet is close to the windward surface of the guide blade.

[0020] Furthermore, the radial extension path of the opening along the rotating shaft is a straight line.

[0021] Furthermore, the windward surface forms a wind outlet tangent line A at the outer edge position, and an angle α is formed between the wind outlet tangent line A and the extension path of the opening, and the angle α is not less than 70 degrees and not more than 180 degrees.

[0022] Furthermore, the windward surface forms a wind outlet tangent line A at the outer edge position, and an angle α is formed between the wind outlet tangent line A and the extension path of the opening, and the angle α is not less than 80 degrees and not more than 140 degrees.

[0023] Furthermore, along the axial direction of the rotating shaft, the outflow port of the opening is not visible.

[0024] Furthermore, the opening is a cylindrical through hole with equal cross-sectional areas at different positions, and the plane where the inner surface of the top plate is located is tangent to the inner hole surface of the opening.

[0025] Furthermore, the plane where the inner surface of the top plate is located is tangent to the inlet;

[0026] The height of one end of the guide vane portion connected to the inner wall surface of the annular wall protruding downward from the inner surface of the top plate is equal to the maximum width of the inlet along the axial direction of the rotating shaft.

[0027] To achieve the above objectives, this application provides the following technical solutions:

[0028] A motor comprising the motor rotor assembly as described in any one of the above items, further comprising:

[0029] The motor base includes a base body and an axle tube formed by protruding upward from the upper surface of the base body;

[0030] A stator assembly is sleeved and fixed on the outer periphery of the shaft tube;

[0031] A bearing assembly is arranged in the shaft tube;

[0032] The free end of the rotating shaft is rotatably implanted in the shaft hole of the bearing member;

[0033] A magnetic member is fixed to the inner wall surface of the annular wall, and the magnetic member surrounds the outer periphery of the stator assembly at intervals and forms a magnetic induction gap with the outer periphery of the stator assembly;

[0034] A set gap is formed between the guide vane portion and the stator assembly along the axial direction of the rotating shaft, and the set gap is not less than 0.5 mm and not more than 3 mm.

[0035] Furthermore, it also includes:

[0036] a preset gap formed between the upper end periphery of the shaft tube and the stator assembly;

[0037] A dust ring is formed by the inner surface of the top plate protruding downward and is arranged around the periphery of one end of the rotating shaft fixed to the top plate, and the lower end of the dust ring protrudes into the preset interval.

[0038] Furthermore, one end of the guide vane is fixedly connected to the outer peripheral surface of the dust ring.

[0039] Furthermore, a step portion is formed protruding from the connection position between the inner wall surface of the annular wall and the upper surface of the top plate, the magnetic member is coupled to the lower surface of the step portion, the opening is formed in the step portion, and the inlet is formed in the inner annular surface of the step portion;

[0040] Each of the guide vanes extends outward from the center of the rotating shaft on the inner surface of the top plate and is integrally connected to the inner side surface of the step portion.

[0041] To achieve the above objectives, this application provides the following technical solutions:

[0042] A cooling fan, comprising the motor rotor assembly as described in any one of the above items, or comprising the motor as described in any one of the above items, further comprising:

[0043] a plurality of fan blades, each of the fan blades extending outwardly from the outer annular surface of the annular wall in a divergent shape, and when the motor rotor assembly rotates, the fan blades can drive airflow to flow in the axial direction of the rotating shaft;

[0044] Each of the fan blades is defined as having a windward surface, a leeward surface, a windward blade edge located in front of the rotation direction of the motor rotor assembly, and a leeward blade edge located behind the rotation direction of the motor rotor assembly;

[0045] Each of the flow outlets is located near the position where the windward blade edge is connected to the outer annular surface of the annular wall, and along the rotation direction of the motor rotor assembly, the flow outlet is located in front of the position where the windward blade edge is connected to the outer annular surface of the annular wall.

[0046] Furthermore, along the axial direction of the rotating shaft, the outflow port does not extend upward beyond the position where the windward blade edge is connected to the outer annular surface of the annular wall.

[0047] Compared with the prior art, the beneficial effects of the present application are: it is conducive to discharging heat inside the motor housing, and is conducive to controlling noise and turbulence. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic cross-sectional view of the heat dissipation fan of the present application, wherein the cross-sectional view is located in the axial direction of the rotating shaft, and only one side of the fan blades and the fan frame is schematically shown.

[0049] Figure 2 is a three-dimensional schematic diagram of the motor rotor assembly of the present application. Further, Figure 2 The fan blades are integrated into the motor rotor assembly.

[0050] Figure 3 yes Figure 2 Enlarged view of the structure within the dashed box.

[0051] Figure 4 yes Figure 2 A side view of the vehicle body, wherein the shaft is not shown.

[0052] Figure 5 yes Figure 4 Enlarged view of the structure within the dashed box.

[0053] Figure 6 It is from Figure 4 Sectional view along line AA.

[0054] Figure 7 yes Figure 6 Enlarged view of the structure within the dashed box.

[0055] Figure 8 yes Figure 2 , with the shaft not shown.

[0056] Figure 9 It is from Figure 8 Cross-sectional view along line BB.

[0057] Figure 10 It is a simulation diagram when the angle α of the fan blade assembly of the cooling fan of the present application is equal to 90 degrees, which mainly shows the airflow direction and flow rate at various positions of the fan blade assembly.

[0058] Figure 11 This is a simulation diagram when the angle α of the fan blade assembly of the cooling fan of the present application is equal to 90 degrees, mainly for showing the air flow velocity at the opening.

[0059] Figure 12This is a simulation diagram when the angle α of the fan blade assembly of the cooling fan of the present application is equal to 135 degrees, mainly for showing the air flow velocity at the opening.

[0060] Figure 13 This is a simulation diagram when the angle α of the fan blade assembly of the cooling fan of the present application is equal to 180 degrees, mainly for showing the air flow velocity at the opening. DETAILED DESCRIPTION

[0061] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] In the description of this application, it should be understood that the terms "include" and "have" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0063] See also Figures 1 to 9 As shown in FIG, a motor rotor assembly, a motor and a cooling fan disclosed in this application. The cooling fan includes: a motor base (not numbered), a stator assembly 53 fixed to the motor base and a fan blade assembly (not numbered). Please refer to Figure 1 As shown, the motor base includes a base body 51, a shaft tube 52 formed by protruding upward from the middle position of the upper surface of the base body 51, and an annular outer frame 54 formed by extending upward from the edge position of the base body 51. The stator assembly 53 is sleeved and fixed on the outer periphery of the shaft tube 52. The shaft tube 52 is hollow and tubular with an open upper end. A bearing member 9 is assembled in the shaft tube 52. Among them, the stator assembly 53 generally includes a plurality of silicon steel sheets (unnumbered) stacked in the up and down directions, a plastic part (unnumbered) that combines the plurality of silicon steel sheets by injection molding, a coil part (unnumbered) wound on the silicon steel sheet and the plastic part, and a circuit board assembly, and the circuit board assembly (unnumbered) is electrically connected to the coil part.

[0064] Please refer to Figures 1 to 9As shown, the fan blade assembly includes a motor rotor assembly (unnumbered) and a plurality of fan blades 7. The motor rotor assembly includes a top plate 1, a ring wall 21 vertically arranged around the periphery of the top plate 1, and a rotating shaft 3 with one end vertically fixed to the middle position of the inner surface 101 of the top plate 1 and cantilevered downward. The top plate 1 and the ring wall 21 together enclose a stator chamber 10 that is open downward. An annular magnetic part 8 is fixed on the inner ring surface of the ring wall 21. The fan blades 7 are formed by the outer ring surface of the ring wall 21 extending outward. The free end of the rotating shaft 3 is rotatably implanted in the axial hole of the bearing part 9 from top to bottom. The magnetic part 8 is spaced around the outer periphery of the stator assembly 53 and forms a magnetic induction gap with the outer periphery of the stator assembly 53. When the circuit board assembly is powered on, the stator assembly 53 is controlled to generate a magnetic field, and after interacting with the magnetic field of the annular magnetic part 8, the fan blade assembly is driven to rotate, so that the fan blade 7 drives the airflow to flow along the axial direction of the rotating shaft 3, thereby achieving the purpose of wind dissipation and heat dissipation.

[0065] Please refer to Figures 2 to 9 As shown, in the embodiment of the present application, the inner surface 101 of the top plate 1 is protruded downward to form a plurality of guide blades 4 ( Figure 9 The perspective is convex upward). Each of the guide blades 4 extends outward from the center of the rotating shaft 3 on the inner surface 101 of the top plate 1. In a preferred embodiment, one end of the guide blade 4 extends to the inner annular surface of the annular wall 21. The guide blade 4 mainly plays the role of driving the wind, forming a role similar to that of a centrifugal fan blade. In a preferred embodiment, the guide blade 4 is formed as a swept-back structure, and the structure is specifically manifested in that, along the rotation direction of the fan blade assembly, the outer end of each of the guide blades 4 (the end away from the rotating shaft 3) is located behind its inner end (the end close to the rotating shaft 3). In the illustrated embodiment of the present application, the guide blade 4 is perpendicular to the inner surface 101 of the top plate 1 along the axial direction of the rotating shaft 3, and the guide blade 4 forms an upright structure on the inner surface 101 of the top plate 1. Furthermore, the guide vanes 4 extend along the inner surface 101 of the top plate 1 in a radial direction of the rotating shaft 3 in a straight line. In other embodiments, the guide vanes 4 may extend along the inner surface 101 of the top plate 1 in an arcuate, such as an S-shaped, path. Each guide vane 4 defines a windward surface 41 and a leeward surface 42 along the circumferential direction of the annular wall 21 (or the direction of rotation of the fan blade assembly).

[0066] Please refer to Figures 2 to 9As shown, a plurality of openings 23 are formed through the annular wall 21, and each of the openings 23 forms an inlet 201 and an outlet 202 on the inner wall surface and the outer wall surface of the annular wall 21, respectively. In a preferred embodiment, one side of each of the guide blades 4 is provided with the opening 23, and the inlet 201 is close to the surface of one side of the guide blade 4. When the fan blade assembly rotates, the plurality of guide blades 4 can achieve a centrifugal wind-driving effect, and in conjunction with the opening 23, the heat inside the stator chamber 10 can be output through the opening 23, so as to dissipate heat inside the stator chamber 10, or to dissipate heat to the stator assembly 53. In addition, in the present application, the opening 23 is designed to be formed through the annular wall 21, and there will be no tangency problem between the airflow discharged through the opening 23 and the motor rotor assembly, thereby reducing turbulence and noise. Furthermore, by designing openings 23 throughout the ring wall 21, when the fan assembly rotates and the multiple blades 7 create a wind, the outer surface of the ring wall 21 generates a negative pressure effect (particularly near the top of the outer surface of the ring wall 21, that is, near the top plate 1). This also allows hot air inside the stator chamber 10 to be drawn out through the openings 23, creating a heat dissipation effect. The top surface of the motor rotor assembly's top plate 1 can remain flat, without any bumps or recesses, reducing turbulence and noise.

[0067] Furthermore, in the embodiments of the present application, the inlet 201 of the opening 23 is preferably located near the windward surface 41 of the guide vane 4. This design allows the airflow, after centrifugal drive by the guide vane 4, to be more smoothly discharged from the opening 23. In a preferred embodiment, the extension path of the opening 23 is a straight line, which, on the one hand, facilitates demolding after injection molding, and on the other hand, reduces resistance to airflow. In the embodiments of the present application, the cross-section of the opening 23 is preferably circular, but other shapes such as polygonal are also possible.

[0068] Please refer to Figures 4 to 9 As shown, in the embodiment of the present application, the windward surface 41 of the guide vane 4 forms a wind outlet tangent line A at the outer edge. In the illustrated embodiment, since the guide vane 4 is in a straight plate shape, the wind outlet tangent line A is the extension line of the windward surface 41. When the extension path of the guide vane 4 is in an arc shape, the wind outlet tangent line A is the tangent line of the windward surface 41 of the guide vane 4 at the outer edge. In the illustrated embodiment, the wind outlet tangent line A forms an angle α with the extension path of the opening 23. In the embodiment of the present application, the guide vane 4 preferably has a swept-back structure. Specifically, the swept-back guide vane 4 has a smoother airflow path, which can reduce the impact of the airflow on the leading edge of the blade (i.e., the guide vane 4), avoid sudden flow separation, delay airflow separation, reduce noise generation, and simultaneously reduce turbulence and eddy current losses, making energy conversion more efficient and the wind-discharging effect better.

[0069] Please refer to Figures 10 to 13 As shown in the figure, the airflow velocity at different positions of a motor rotor assembly integrated with multiple blades 7 is simulated using ANSYS Fluent software. ANSYS Fluent is a powerful general-purpose computational fluid dynamics (CFD) software that is widely used to simulate fluid flow, heat transfer, mass exchange, and chemical reaction processes. Specifically, Figure 10 In the figure, the specific location of the opening 23 is marked. Figures 11 to 13 In the figure, the specific locations of the opening 23 and the guide vane 4 are marked. Figure 11 The figure shows the air flow velocity in the opening 23 when the angle α is 90 degrees; Figure 12 The figure shows the air flow velocity in the opening 23 when the angle α is 135 degrees; Figure 13 The figure shows the airflow velocity in the opening 23 when the angle α is 180 degrees. The left side of the figure shows that the color closer to the upper red represents a faster airflow velocity, and the color closer to the lower blue represents a slower airflow velocity. Figure 11 、 Figure 12 and Figure 13 It can be clearly seen that when the angle α is 90 degrees, the air flow rate blown out through the opening 23 is the fastest, which means the heat dissipation effect is the best. Of course, the designer does not only verify the Figure 11 、 Figure 12 and Figure 13 Instead of the three schemes shown, a simulation is performed every 5 degrees from the angle α in the range of 70 degrees to 180 degrees (including the end points), and it is finally obtained that when the angle α is in the range of not less than 70 degrees and not more than 180 degrees, the air flow rate discharged through the opening 23 is better; of course, when the angle α is in the range of not less than 80 degrees and not more than 140 degrees, the air flow rate discharged through the opening 23 is better; when the actual angle α is equal to 90 degrees, the air flow rate discharged through the opening 23 is the best.

[0070] Please refer to Figures 6 to 9As shown, in order to achieve the above-mentioned better effect, in the embodiment of the present application, the outflow outlet 202 of the opening 23 is not visible along the axial direction of the rotating shaft 3. The outflow outlet 202 of the opening 23 is formed on the outer wall surface of the upright ring wall 21. Furthermore, in a preferred embodiment, the opening 23 is a cylindrical through hole with equal cross-sectional areas at different positions, preferably a circular hole, and the plane where the inner surface 101 of the top plate 1 is located is tangent to the inner hole surface of the opening 23. In a preferred embodiment, the height of the end of the guide blade 4 connected to the inner wall surface of the ring wall 21 protruding downward from the inner surface 101 of the top plate 1 is equal to the maximum height of the inflow outlet 201 along the axial direction of the rotating shaft 3. This can ensure that the airflow can be discharged more smoothly through the opening 23, reducing the occurrence of turbulence and the like.

[0071] Furthermore, in order to achieve the above-mentioned better effect, in the embodiment of the present application, a set gap is formed between the guide vane 4 and the stator assembly 53 along the axial direction of the rotating shaft 3, and the set gap is not less than 0.5 mm and not more than 3 mm. A preset gap 50 is formed between the outer periphery of the upper end of the shaft tube 52 and the stator assembly 53. It also includes a dust ring 6, which is formed by the inner surface 101 of the top plate 1 protruding downward and is arranged around the outer periphery of the end where the rotating shaft 3 and the top plate 1 are fixed. The lower end edge of the dust ring 6 protrudes into the preset gap 50 to achieve a dust-proof effect. Furthermore, in a preferred embodiment, one end (inner end) of the guide vane 4 is fixedly connected to the outer peripheral surface of the dust ring 6.

[0072] Furthermore, in a preferred embodiment, a step portion 2001 is protruded from the connection position between the inner wall surface of the annular wall 21 and the upper surface of the top plate 1. In a preferred embodiment, the other end (outer end) of the guide vane 4 is integrally connected to the step portion 2001. The magnetic member 8 is coupled to the lower surface of the step portion 2001. The opening 23 is formed in the step portion 2001. The inlet 201 is formed on the inner annular surface of the step portion 2001. The opening 23 does not penetrate the lower surface of the step portion 2001 (that is, the surface parallel to the inner surface 101 of the top plate 1) along the axial direction of the rotating shaft 3.

[0073] Please refer to Figures 2 to 7 As shown, each of the fan blades 7 is defined to have a windward surface 71, a leeward surface 72, a windward blade edge 73 located in front of the rotation direction of the motor rotor assembly, and a leeward blade edge 74 located behind the rotation direction of the motor rotor assembly. Each of the flow outlets 202 is located near the position where the windward blade edge 73 connects with the outer annular surface of the annular wall 21, and along the rotation direction of the motor rotor assembly, the flow outlet 202 is located in front of the position where the windward blade edge 73 connects with the outer annular surface of the annular wall 21. In a preferred embodiment, along the axial direction of the rotating shaft 3, the flow outlet 202 is upward (refer to FIG. Figure 1 、 Figure 2 and Figure 4 The display angle) does not exceed the position where the windward blade edge 73 is connected to the outer annular surface of the annular wall 21. Such a design can achieve that the airflow discharged from the opening 23 can be driven more smoothly by the windward surface 71 of the fan blade 7 (see Figure 1 and Figure 2 In the display angle, the windward surface 71 of the fan blade 7 drives the airflow downward), reducing turbulence and noise.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present design, rather than to limit it. Although the present design has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present design.

[0075] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A motor, characterized in that: include: Top plate (1); A ring wall (21) is vertically arranged around the periphery of the top plate (1); The stator chamber (10) is formed by the top plate (1) and the annular wall (21) and is open downwards; A rotating shaft (3) has one end vertically fixed to the middle position of the inner surface (101) of the top plate (1) and cantilevered downward; A plurality of guide blades (4) are formed by protruding from the inner surface (101) of the top plate (1), and each of the guide blades (4) extends outward from the center of the rotating shaft (3) on the inner surface (101) of the top plate (1); An opening (23) is formed through the annular wall (21), and an inlet (201) and an outlet (202) are formed on the inner wall surface and the outer wall surface of the annular wall (21), respectively; The plurality of guide vanes (4) are capable of driving the airflow inside the stator chamber (10) to flow from the inlet (201) into the opening (23) and out from the outlet (202); The opening (23) is provided on one side of each guide vane (4), and the guide vane (4) is formed into a swept-back structure; The motor base comprises a base body (51) and an axle tube (52) formed by protruding upward from the upper surface of the base body (51); A stator assembly (53) is sleeved and fixed on the outer circumference of the shaft tube (52); A bearing member (9) is assembled in the shaft tube (52), and the free end of the rotating shaft (3) is rotatably implanted in the shaft hole of the bearing member (9); A magnetic member (8) is fixed to the inner wall surface of the annular wall (21), and the magnetic member (8) surrounds the outer periphery of the stator assembly (53) at intervals and forms a magnetic induction gap with the outer periphery of the stator assembly (53); A set gap is formed between the guide vane (4) and the stator assembly (53) along the axial direction of the rotating shaft (3); A dustproof ring (6) is formed by a downwardly protruding inner surface (101) of the top plate (1) and is arranged around the periphery of one end of the rotating shaft (3) fixed to the top plate (1), and one end of the guide vane (4) is fixedly connected to the outer peripheral surface of the dustproof ring (6); A preset gap (50) is formed between the outer periphery of the upper end of the shaft tube (52) and the stator assembly (53), and the lower end of the dust ring (6) protrudes into the preset gap (50); A step portion (2001) is formed at a connection position between the inner wall surface of the annular wall (21) and the upper surface of the top plate (1), the magnetic member (8) is coupled to the lower surface of the step portion (2001), the opening (23) is formed on the step portion (2001), the inlet (201) is formed on the inner annular surface of the step portion (2001), and each of the guide vanes (4) extends outward from the center of the rotating shaft (3) on the inner surface (101) of the top plate (1) and is integrally connected to the inner side surface of the step portion (2001).

2. The motor according to claim 1, wherein: Each of the guide vanes (4) extends outwardly from the center of the rotating shaft (3) on the inner surface (101) of the top plate (1) to the inner wall surface of the ring wall (21), and the inlet (201) is close to a side surface of the guide vane (4).

3. The motor according to claim 1 or 2, characterized in that: The guide vane (4) is perpendicular to the inner surface (101) of the top plate (1) along the axial direction of the rotating shaft (3).

4. The motor according to claim 1 or 2, characterized in that: Each of the guide blades (4) is defined with a windward surface (41) and a leeward surface (42) along the circumferential direction of the annular wall (21), and the inlet (201) is close to the windward surface (41) of the guide blade (4).

5. The motor according to claim 1 or 2, characterized in that: The radial extension path of the opening (23) along the rotating shaft (3) is a straight line.

6. The motor according to claim 4, characterized in that: The windward surface (41) forms a wind outlet tangent line A at the outer edge position, and an angle α is formed between the wind outlet tangent line A and the extension path of the opening (23), and the angle α is not less than 70 degrees and not more than 180 degrees.

7. The motor according to claim 4, characterized in that: The windward surface (41) forms a wind outlet tangent line A at the outer edge position, and an angle α is formed between the wind outlet tangent line A and the extension path of the opening (23), and the angle α is not less than 80 degrees and not more than 140 degrees.

8. The motor according to claim 1 or 2, characterized in that: Along the axial direction of the rotating shaft (3), the outflow port (202) of the opening (23) is not visible.

9. The motor according to claim 1 or 2, characterized in that: The opening (23) is a cylindrical through hole with equal cross-sectional areas at different positions, and the plane where the inner surface (101) of the top plate (1) is located is tangent to the inner hole surface of the opening (23).

10. The motor according to claim 1 or 2, characterized in that: The plane where the inner surface (101) of the top plate (1) is located is tangent to the inlet (201); The height of one end of the guide vane (4) connected to the inner wall surface of the annular wall (21) protruding downward from the inner surface (101) of the top plate (1) is equal to the maximum width of the inlet (201) along the axial direction of the rotating shaft (3).

11. The motor according to claim 1 or 2, characterized in that: The set gap is not less than 0.5 mm and not more than 3 mm.

12. A cooling fan comprising the motor according to any one of claims 1 to 11, characterized in that: Also includes: a plurality of fan blades (7), each of the fan blades (7) extending outward in a divergent shape from the outer ring surface of the annular wall (21), and when the motor rotor assembly rotates, the fan blades (7) can drive the airflow to flow in the axial direction of the rotating shaft (3); Each of the fan blades (7) is defined to have a windward surface (71), a leeward surface (72), a windward blade edge (73) located in front of the rotation direction of the motor rotor assembly, and a leeward blade edge (74) located behind the rotation direction of the motor rotor assembly; Each of the flow outlets (202) is located near a position where the windward blade edge (73) is connected to the outer annular surface of the annular wall (21), and along the rotation direction of the motor rotor assembly, the flow outlet (202) is located in front of a position where the windward blade edge (73) is connected to the outer annular surface of the annular wall (21).

13. The heat dissipation fan according to claim 12, wherein: Along the axial direction of the rotating shaft (3), the outflow port (202) does not extend upward beyond the position where the windward blade edge (73) is connected to the outer annular surface of the annular wall (21).

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