Motor rotor assembly, motor and cooling fan

Abstract

The invention discloses a motor rotor assembly, a motor and a cooling fan. The motor rotor assembly comprises a top plate; the ring wall is vertically and annularly arranged on the periphery of the top plate; the stator chamber is defined by the top plate and the ring wall and is opened downwards; one end of the rotating shaft is vertically fixed in the middle of the inner surface of the top plate and is downward in a cantilever shape; the flow guide blade parts are formed by protruding from the inner surface of the top plate, and all the flow guide blade parts are diverged outwards from the center of the rotating shaft on the inner surface of the top plate and extend to the inner wall face of a ring wall; the open hole is formed in the ring wall in a penetrating mode, and an inflow port and an outflow port are formed in the inner wall face and the outer wall face of the ring wall respectively; and one side of each flow guide blade part is provided with the corresponding open hole in a matched mode, and the flow inlet is close to the surface of one side of the flow guide blade part. According to the scheme, heat in the motor shell can be discharged easily, and noise and turbulent flow can be controlled easily.

Description

Technical Field

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

[0002] For the prior art, reference can be made to the Chinese utility model patent CN212360261U. This patent discloses a cooling fan that conducts internal heat dissipation through the through holes between the fan blades and the motor housing, including: a fan frame, fan blades, a motor, and a PCB board; the fan frame is provided with a fan base, support arms, and a wire bundling support arm. The fan base is fixedly connected to the fan frame through the support arms and the wire bundling 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 fan blade heat dissipation through holes, 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, a wrapped core, and a second bearing. The riveted motor housing is provided with a motor rivet shaft core and motor housing heat dissipation through holes, and the positions where the motor housing heat dissipation through holes are opened correspond to the fan blade heat dissipation through holes; the wrapped core is composed of a winding combination and a winding support, and the wrapped core is provided with a wrapped core fixing hole and a metal guide post; the prior art aims to solve the problems and deficiencies such as how to dissipate heat inside the motor and improve the service life.

[0003] However, both the fan blade heat dissipation through holes and the motor housing heat dissipation through holes in this prior art (CN212360261U) are provided at the center of the fan blade, that is, on the top plate of the motor housing. Referring to the attached drawings of the prior art Figure 2 , when the fan blade rotates at high speed to drive the air (rotating counterclockwise), the driving air flow moves from top to bottom. Part of the air flow will flow inward through the fan blade heat dissipation through holes and the motor housing heat dissipation through holes into the interior of the motor housing to dissipate heat from the stator elements and circuit boards inside the motor housing. However, due to the high-speed rotation of the fan blade in this structure, a cut angle will be formed between the inner walls of the fan blade heat dissipation through holes and the motor housing heat dissipation through holes and the air flowing from top to bottom, which will cause problems such as noise and turbulence, and actually is not conducive to the smooth input of the air flow from top to bottom through the fan blade heat dissipation through holes and the motor housing heat dissipation through holes into the motor housing.

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

[0005] In this prior art (CN101498320B), the connecting member 222 of the exhaust structure 22 is in the opposite direction to the inclination or bending direction of the fan blade. When the motor 20 of the fan 2 drives the impeller 215 to rotate, due to the connection between the exhaust structure 22 and the impeller 215, the connecting member 222 also rotates with the impeller 215 at the same time. Therefore, the hot air generated by the motor 20 can be led out from the inside to the outside through the magnetic conductive shell 213 with a hollow shell structure and the exhaust structure 22, and will not accumulate inside the magnetic conductive shell 213. The direction of the hot air dissipation is as shown by the dotted arrow in the prior art Figure 3 As shown. This will cause the air flow driving directions between the fan for actual air blowing and the exhaust structure 22 for heat dissipation to be opposite. For specific reference, in the prior art Figure 3 as shown, the fan blade drives the air flow downward, and the exhaust structure 22 drives the air flow upward. This will cause a serious air turbulence effect, affecting the actual air blowing performance of the fan (affecting the air blowing performance of the fan blade), and will also generate greater noise problems.

[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 the present application is to provide a new motor rotor assembly, motor and cooling fan, which is beneficial to discharging the heat inside the motor housing and is beneficial to controlling noise and turbulence.

[0008] To achieve the above object, the present application provides the following technical solutions: A motor rotor assembly, comprising: A top plate; A ring wall, vertically arranged around the periphery of the top plate; A stator chamber, formed jointly by the top plate and the ring wall and having an opening downward; A rotating shaft, one end of which is vertically fixed at the middle position of the inner surface of the top plate and is in a cantilever shape downward; A plurality of guide vane parts, protruding from the inner surface of the top plate, and each of the guide vane parts extends radially outward from the center of the rotating shaft on the inner surface of the top plate; An opening, formed through the ring wall, and a fluid inlet and a fluid outlet are respectively formed on the inner wall surface and the outer wall surface of the ring wall; The plurality of guide vane parts can drive the air flow inside the stator chamber to flow into the opening from the fluid inlet and flow out from the fluid outlet.

[0009] Further, each of the guide vane parts extends radially 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 an opening is disposed on one side of each of the guide vane parts, and the fluid inlet is close to the side surface of the guide vane part.

[0010] Further, the guiding vane portion is perpendicular to the inner surface of the top plate along the axial direction of the rotating shaft.

[0011] Further, each of the guiding vane portions defines a windward surface and a leeward surface along the circumferential direction of the annular wall, and the fluid inlet is close to the windward surface of the guiding vane portion.

[0012] Further, the extending path of the opening along the radial direction of the rotating shaft is a straight line.

[0013] Further, an air outlet tangent line A is formed at the outer edge position of the windward surface, and an included angle α is formed between the air outlet tangent line A and the extending path of the opening, and the included angle α is not less than 70 degrees and not more than 180 degrees.

[0014] Further, an air outlet tangent line A is formed at the outer edge position of the windward surface, and an included angle α is formed between the air outlet tangent line A and the extending path of the opening, and the included angle α is not less than 80 degrees and not more than 140 degrees.

[0015] Further, along the axial direction of the rotating shaft, the fluid outlet of the opening is not visible.

[0016] Further, the opening is a columnar 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.

[0017] Further, the plane where the inner surface of the top plate is located is tangent to the fluid inlet; The height by which the end of the guiding vane portion connected to the inner wall surface of the annular wall protrudes downward from the inner surface of the top plate is equal to the maximum width of the fluid inlet along the axial direction of the rotating shaft.

[0018] To achieve the above object, the present application provides the following technical solutions: A motor, comprising the motor rotor assembly as described in any one of the above, further comprising: A motor base, comprising a base body and a shaft tube protruding upward from the upper surface of the base body; A stator assembly, sleeved and fixed on the outer periphery of the shaft tube; A bearing member, assembled in the shaft tube; The free end of the rotating shaft is rotatably implanted into the shaft hole of the bearing member; A magnetic member, fixed on the inner wall surface of the annular wall, and the magnetic member is spaced around the outer periphery of the stator assembly and forms a magnetic induction gap between the magnetic member and the outer periphery of the stator assembly; A set gap is formed between the guiding 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.

[0019] Further, it further comprises: A preset gap is formed between the outer periphery of the upper end of the shaft tube and the stator assembly; A dust-proof ring is formed by protruding downward from the inner surface of the top plate and is disposed around the periphery of one end where the rotating shaft is fixed to the top plate. The lower end of the dust-proof ring protrudes into the preset gap.

[0020] Further, one end of the guide vane portion is fixedly connected to the outer peripheral surface of the dust-proof ring.

[0021] Further, a step portion is formed by protruding at the connection position between the inner wall surface of the ring 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 inflow port is formed in the inner ring surface of the step portion; Each of the guide vane portions extends outward in a divergent manner 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.

[0022] To achieve the above object, the present application provides the following technical solutions: A cooling fan includes the motor rotor assembly described in any one of the above, or includes the motor described in any one of the above, and further includes: A plurality of fan blades, each of the fan blades extends outward in a divergent shape from the outer ring surface of the ring wall. When the motor rotor assembly rotates, the fan blades can drive the air flow to flow along the axial direction of the rotating shaft; Each of the fan blades is defined to form a windward surface, a leeward surface, a windward leaf edge located in front of the rotation direction of the motor rotor assembly, and a leeward leaf edge located behind the rotation direction of the motor rotor assembly; Each of the outflow ports is located at a position close to the connection between the windward leaf edge and the outer ring surface of the ring wall, and along the rotation direction of the motor rotor assembly, the outflow port is located in front of the connection position between the windward leaf edge and the outer ring surface of the ring wall.

[0023] Further, along the axial direction of the rotating shaft, the outflow port does not extend upward beyond the connection position between the windward leaf edge and the outer ring surface of the ring wall.

[0024] Compared with the prior art, the beneficial effects of the present application are: it is beneficial to discharge the heat inside the motor housing, and is beneficial to controlling noise and turbulent flow. Description of the Drawings

[0025] Figure 1 is a schematic cross-sectional view of the cooling fan of the present application, and the cross-sectional position is the axial direction of the rotating shaft. In addition, only a part of one side of the fan blade and the fan frame is schematically shown.

[0026] 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 on the motor rotor assembly in

[0027] Figure 3 is Figure 2 An enlarged view of the structure within the dashed-line box in

[0028] Figure 4 is Figure 2 A side view of , where the rotating shaft is not shown.

[0029] Figure 5 is Figure 4 An enlarged view of the structure within the dashed-line box in

[0030] Figure 6 is a sectional view taken along line A-A from Figure 4 in .

[0031] Figure 7 is Figure 6 An enlarged view of the structure within the dashed-line box in

[0032] Figure 8 is Figure 2 A bottom view of , where the rotating shaft is not shown.

[0033] Figure 9 is a sectional view taken along line B-B from Figure 8 in .

[0034] Figure 10 is a simulation schematic diagram when the included angle α of the fan blade assembly of the heat dissipation fan in the present application is equal to 90 degrees, mainly showing the air flow direction and velocity at each position of the fan blade assembly.

[0035] Figure 11 is a simulation schematic diagram when the included angle α of the fan blade assembly of the heat dissipation fan in the present application is equal to 90 degrees, mainly for showing the air flow velocity at the opening.

[0036] Figure 12 is a simulation schematic diagram when the included angle α of the fan blade assembly of the heat dissipation fan in the present application is equal to 135 degrees, mainly for showing the air flow velocity at the opening.

[0037] Figure 13 is a simulation schematic diagram when the included angle α of the fan blade assembly of the heat dissipation fan in the present application is equal to 180 degrees, mainly for showing the air flow velocity at the opening. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] In the description of the present application, it should be understood that the terms "comprising" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] Please refer to Figures 1 to 9 As shown, a motor rotor assembly, a motor and a cooling fan are disclosed in the present application. The cooling fan includes: a motor base (not labeled), a stator assembly 53 fixed on the motor base, and a fan blade assembly (not labeled). Please refer to Figure 1 As shown, the motor base includes a base body 51, a shaft tube 52 protruding upward from the middle position of the upper surface of the base body 51, and an annular outer frame 54 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 (not labeled) is assembled in the shaft tube 52. Among them, the stator assembly 53 generally includes a plurality of silicon steel sheets (not labeled) stacked in the up and down direction, a plastic part (not labeled) integrally formed by injection molding of the plurality of silicon steel sheets, a coil part (not labeled) wound on the silicon steel sheets and the plastic part, and a circuit board assembly. The circuit board assembly (not labeled) is electrically connected to the coil part.

[0041] Please refer to in combination Figures 1 to 9 As shown, the fan blade assembly includes a motor rotor assembly (not labeled) and a plurality of fan blades 7. The motor rotor assembly includes a top plate 1, a ring wall 21 vertically disposed around the periphery of the top plate 1, and a rotating shaft 3 vertically fixed at the middle position of the inner surface 101 of the top plate 1 at one end and extending downward in a cantilever shape. The top plate 1 and the ring wall 21 jointly enclose a stator chamber 10 with an open bottom. An annular magnetic member 8 is fixed on the inner ring surface of the ring wall 21. The fan blades 7 extend outward from the outer ring surface of the ring wall 21. The free end of the rotating shaft 3 is rotatably inserted into the shaft hole of the bearing member from top to bottom. The magnetic member 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 member 8, the fan blade assembly is driven to rotate, so as to drive the fan blades 7 to drive the air flow along the axial direction of the rotating shaft 3, thereby achieving the purpose of driving air for heat dissipation.

[0042] Please refer to in combination Figures 2 to 9 As shown, in the embodiment of the present application, a plurality of flow guiding blade portions 4 protrude downward from the inner surface 101 of the top plate 1 ( Figure 9The perspective is convex upward). Each of the flow guiding blade parts 4 extends outwardly 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 flow guiding blade part 4 extends to the inner ring surface of the annular wall 21. The flow guiding blade part 4 mainly functions to drive the wind, forming a function similar to that of the blades of a centrifugal fan. In a more preferred embodiment, the flow guiding blade part 4 is formed into a swept-back structure. Specifically, along the rotation direction of the fan blade assembly, the outer end (the end far from the rotating shaft 3) of each of the flow guiding blade parts 4 is located behind its inner end (the end close to the rotating shaft 3). In the illustrated embodiment of the present application, the flow guiding blade part 4 is perpendicular to the inner surface 101 of the top plate 1 in the axial direction of the rotating shaft 3, and the flow guiding blade part 4 forms an upright structure on the inner surface 101 of the top plate 1. In addition, the extending paths of each of the flow guiding blade parts 4 along the radial direction of the rotating shaft 3 on the inner surface 101 of the top plate 1 are linear; of course, in other embodiments, the extending paths of each of the flow guiding blade parts 4 on the inner surface 101 of the top plate 1 may also be arc-shaped, such as an S shape, etc. Each of the flow guiding blade parts 4 defines a windward surface 41 and a leeward surface 42 along the circumferential direction of the annular wall 21 (or the rotation direction of the fan blade assembly).

[0043] Please refer to Figures 2 to 9 As 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 more preferred embodiment, each of the flow guiding blade parts 4 is provided with the opening 23 on one side, and the inlet 201 is close to the side surface of the flow guiding blade part 4. When the fan blade assembly rotates, the plurality of flow guiding blade parts 4 can achieve a centrifugal wind driving effect, and cooperate with the opening 23 to output the heat inside the stator chamber 10 through the opening 23, so as to dissipate the heat inside the stator chamber 10, or to dissipate the heat of 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 problem of tangency between the air flow discharged through the opening 23 and the motor rotor assembly, reducing the generation of turbulent flow and noise. In addition, the opening 23 is designed to be formed through the annular wall 21. When the fan blade assembly rotates, during the process of the plurality of fan blades 7 driving the wind, a negative pressure effect will be generated on the outer wall surface of the annular wall 21 (especially the position on the outer wall surface of the annular wall 21 close to the upper part, that is, the position on the outer wall surface of the annular wall 21 close to the top plate 1), which itself can also suck out the hot air inside the stator chamber 10 from the opening 23 to form a heat dissipation effect. The upper surface of the top plate 1 of the motor rotor assembly can be kept flat without any concave-convex design, improving the turbulent flow and noise.

[0044] Further, in the embodiments of the present application, preferably, the inlet 201 of the opening 23 is designed at a position close to the windward surface 41 of the guide vane portion 4. Such a design can enable the air flow centrifugally driven by the guide vane portion 4 to be more smoothly output from the opening 23. In a preferred embodiment, the extending path of the opening 23 is a straight line. On the one hand, it is for the convenience of demolding after injection molding, and on the other hand, it can reduce the resistance to the air flow. In the embodiments of the present application, the cross-section of the opening 23 is preferably circular, but of course, it can also be other shapes such as polygons.

[0045] Please refer to Figures 4 to 9 As shown, in the embodiments of the present application, an air outlet tangent A is formed at the outer edge position of the windward surface 41 of the guide vane portion 4. In the illustrated embodiment, since the guide vane portion 4 is a straight plate shape, the air outlet tangent A is also the extension line of the windward surface 41. When the extending path of the guide vane portion 4 is an arc shape, the air outlet tangent A is the tangent of the windward surface 41 of the guide vane portion 4 at the outer edge position. In the illustrated embodiment, an angle α is formed between the air outlet tangent A and the extending path of the opening 23. In the embodiments of the present application, the guide vane portion 4 is preferably a swept-back structure. Specifically, the guide vane portion 4 with a swept-back structure has a smoother air flow path, which can reduce the impact of the air flow on the leading edge of the blade (i.e., the guide vane portion 4), avoid sudden flow separation, delay air flow separation, reduce the generation of noise, and at the same time can also reduce turbulent flow and eddy current losses, making the energy conversion more efficient and the wind driving effect better.

[0046] Please refer to Figures 10 to 13 As shown, it is the simulation of the air flow velocity at different positions during the rotation of the motor rotor assembly integrated with multiple fan blades 7 by using the ANSYS Fluent software. ANSYS Fluent is a powerful general computational fluid dynamics (CFD) software, which is widely used in simulating fluid flow, heat transfer, mass transfer, and chemical reaction processes, etc. Specifically, in Figure 10 , the specific location of the opening 23 is marked. In Figures 11 to 13 , the specific locations of the opening 23 and the guide vane portion 4 are marked. Among them Figure 11 shows the air flow velocity in the opening 23 when the angle α is 90 degrees; among them Figure 12 shows the air flow velocity in the opening 23 when the angle α is 135 degrees; among them Figure 13 shows the air flow velocity in the opening 23 when the angle α is 180 degrees. The closer the color on the left side of the attached drawing is to the upper red, the faster the air flow velocity is represented, and the closer the color is to the lower blue, the slower the air flow velocity is represented. From Figure 11 , Figure 12 and Figure 13It can be clearly seen that when the included angle α is 90 degrees, the air flow velocity blown out through the opening 23 is the fastest, representing the best heat dissipation effect. Of course, in the implementation of the design verification by the designer, not only the three solutions shown in Figure 11 , Figure 12 and Figure 13 were verified, but simulations were carried out every 5 degrees within the range where the included angle α is from 70 degrees to 180 degrees (including the endpoints). Finally, it was obtained that when the included angle α is within the range of not less than 70 degrees and not more than 180 degrees, the air flow velocity discharged through the opening 23 is better; of course, when the included angle α is within the range of not less than 80 degrees and not more than 140 degrees, the air flow velocity discharged through the opening 23 is better; when the actual included angle α is equal to 90 degrees, the air flow velocity discharged through the opening 23 is the best.

[0047] Please refer to Figures 6 to 9 shown. In order to achieve the above better effects, in the embodiment of the present application, along the axial direction of the rotating shaft 3, the outlet 202 of the opening 23 is not visible. The outlet 202 of the opening 23 is formed on the outer wall surface of the upright annular wall 21. Further, in a preferred embodiment, the opening 23 is a columnar through hole with equal cross-sectional areas at different positions, preferably a round 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 by which the end of the guide vane portion 4 connected to the inner wall surface of the annular wall 21 protrudes downward from the inner surface 101 of the top plate 1 is equal to the maximum height of the inlet 201 along the axial direction of the rotating shaft 3. In this way, it can be ensured that the air flow can be discharged more smoothly through the opening 23, reducing the occurrence of turbulent flow and other situations.

[0048] Further, in order to achieve the above better effects, in the embodiment of the present application, a set gap is formed between the guide vane portion 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 interval 50 is formed between the outer periphery of the upper end of the shaft tube 52 and the stator assembly 53. Further, a dust-proof ring 6 is also included, and the dust-proof ring 6 is formed by protruding downward from the inner surface 101 of the top plate 1 and is disposed around the periphery of the end of the rotating shaft 3 fixed to the top plate 1. The lower edge of the dust-proof ring 6 protrudes into the preset interval 50 to achieve the dust-proof effect. Further, in a preferred embodiment, one end (inner end) of the guide vane portion 4 is fixedly connected to the outer peripheral surface of the dust-proof ring 6.

[0049] Further, in a preferred embodiment, a step portion 2001 is formed protruding at 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 portion 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 inflow port 201 is formed in the inner annular surface of the step portion 2001. The opening 23 does not penetrate the lower surface of the step portion 2001 along the axial direction of the rotating shaft 3 (that is, the surface parallel to the inner surface 101 of the top plate 1).

[0050] Please refer to Figures 2 to 7 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 outflow ports 202 is located near the connection position between the windward blade edge 73 and the outer annular surface of the annular wall 21, and along the rotation direction of the motor rotor assembly, the outflow port 202 is located in front of the connection position between the windward blade edge 73 and the outer annular surface of the annular wall 21. In a preferred embodiment, along the axial direction of the rotating shaft 3, the outflow port 202 does not extend upward (refer to Figure 1 、 Figure 2 and Figure 4 the display angle) beyond the connection position between the windward blade edge 73 and the outer annular surface of the annular wall 21. Such a design can enable the airflow discharged from the opening 23 to be more smoothly driven by the windward surface 71 of the fan blade 7 (refer to Figure 1 and Figure 2 in the display angle, the windward surface 71 of the fan blade 7 drives the airflow downward), reducing the generation of turbulent flow and noise.

[0051] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this design, rather than to limit it; although the present design has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and 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 this design.

[0052] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A motor rotor assembly, characterized in that: include: Top plate (1); A ring wall (21) vertically arranged around the periphery of the top plate (1); The stator chamber (10) is formed by the top plate (1) and the ring wall (21) and is open downwards; A rotating shaft (3), one end of which is vertically fixed to the middle position of the inner surface (101) of the top plate (1) and is 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 outwards 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) can drive the airflow inside the stator chamber (10) to flow from the inlet (201) into the opening (23) and out from the outlet (202).

2. The motor rotor assembly according to claim 1, characterized in that: 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 one side of each of the guide vanes (4) is provided with the opening (23), and the inlet (201) is close to one side surface of the guide vane (4).

3. The motor rotor assembly 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 rotor assembly 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 rotor assembly 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 rotor assembly 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 rotor assembly 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 rotor assembly 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 rotor assembly according to claim 1 or 2, characterized in that: The opening (23) is a columnar 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 rotor assembly 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 ring 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. A motor, comprising the motor rotor assembly according to any one of claims 1 to 10, characterized in that: Also includes: 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 component, assembled in the shaft tube (52); The free end of the rotating shaft (3) is rotatably implanted in the shaft hole of the bearing component; A magnetic member (8) is fixed to the inner wall surface of the annular wall (21), 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 portion (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 millimeters and not more than 3 millimeters.

12. The motor according to claim 11, characterized in that Also includes: A preset gap (50) is formed between the upper end periphery of the shaft tube (52) and the stator assembly (53); A dustproof ring (6) is formed by the inner surface (101) of the top plate (1) protruding downwards and is arranged around the periphery of one end of the rotating shaft (3) fixed to the top plate (1), with the lower end of the dustproof ring (6) protruding into the preset interval (50).

13. The motor according to claim 12, characterized in that: One end of the guide vane (4) is fixedly connected to the outer peripheral surface of the dustproof ring (6).

14. The motor according to claim 11, characterized in that: A step portion (2001) is formed protruding from the 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), and the inlet (201) is formed on the inner annular surface of the step portion (2001); 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).

15. A heat dissipation fan, comprising the motor rotor assembly according to any one of claims 1 to 10, or comprising the motor according to any one of claims 11 to 14, characterized in that: Also includes: a plurality of fan blades (7), each of the fan blades (7) extending outwardly from the outer ring surface of the ring wall (21) in a divergent shape, and when the motor rotor assembly rotates, the fan blades (7) can drive the airflow to flow along 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 close to 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).

16. The heat dissipation fan according to claim 15, characterized in that: 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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