Motor with diversion structure and brushless dust collector

Abstract

The utility model discloses a motor with a flow guide structure and a brushless dust collector. The motor comprises a motor cylinder, an impeller cover and a movable impeller, and a plurality of second blades distributed around the circumference of the axis of the movable impeller in an array mode are formed on the movable impeller; a plurality of first blades which are distributed around the circumference of the axis of the flow guide part in an array mode are formed on the flow guide part; the first blades and the second blades are alternately arranged, the first blades and the adjacent second blades on the two sides of the first blades are arranged at equal-angle intervals, a first air inlet channel is formed between every two adjacent first blades, and a second air inlet channel is formed between every two adjacent second blades. A strand of air fluid can flow from the first air inlet channel to the two adjacent second air inlet channels. According to the utility model, air fluid can enter the motor more smoothly, so that the air inlet efficiency is improved, and the noise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to a motor with a flow guiding structure and a brushless vacuum cleaner. Background Technology

[0002] Permanent magnet motors, as one of the components of motors, are widely used in household appliances, garden tools, transportation vehicles and other fields. Existing sweepers or vacuum cleaners usually use motors equipped with impellers. The motor drives the impeller to rotate, so that the air is first axially introduced, then converted into radial air introduced by the impeller, and then enters the motor axially along the inner wall of the casing.

[0003] When external air is drawn in, the airflow is relatively turbulent, which leads to problems such as low intake efficiency and high noise. The rectifier device currently installed at the front end of the impeller of the existing motor is generally a rectifier cap. The conical outer surface of the rectifier cap makes the air enter the motor more smoothly. However, the impeller rotation and the airflow entering the motor through the impeller of this type of motor still have problems such as insufficient intake efficiency and high noise. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a motor and brushless vacuum cleaner with a flow guiding structure, which allows airflow to enter the motor more smoothly through the impeller, thereby improving air intake efficiency and reducing noise.

[0005] This utility model is achieved through the following technical solution:

[0006] A motor with a flow guiding structure includes a motor barrel and a moving impeller. The motor barrel includes a stator assembly and a rotor assembly that cooperates with the stator assembly. The moving impeller is connected to the output shaft of the rotor assembly. The motor further includes:

[0007] A flow guide is coaxial with the impeller and arranged sequentially along the air inlet direction. Multiple first blades are formed on the flow guide in a circumferential array around the axis of the flow guide.

[0008] Multiple second blades are formed on the moving impeller and are arranged in a circumferential array around the axis of the moving impeller.

[0009] A first air inlet channel is formed between two adjacent first blades, and a second air inlet channel is formed between two adjacent second blades. The airflow from the outlet of the first air inlet channel can flow into the second air inlet channel.

[0010] Furthermore, the airflow exiting the first air inlet channel can flow in layers into at least two second air inlet channels.

[0011] Furthermore, the ratio of the first width at the air inlet of the first air inlet channel to the second width at the air outlet is 0.77-0.91.

[0012] Furthermore, the ratio of the first thickness at the upper end of the first blade to the second thickness at the lower end is 0.80-0.90.

[0013] Furthermore, the ratio of the first distance from the first end point of the first blade to its center to the second distance from the second end point of the upper end point of the second blade to its center is between 0.65 and 0.8.

[0014] Furthermore, the upper end of the first blade is located outside the main air inlet of the motor cylinder in the air inlet direction, and the lower end of the first blade is located inside the main air inlet of the motor cylinder in the air inlet direction.

[0015] Furthermore, the number of the first blades and the second blades are equal, and in the axial projection direction, the multiple first air inlet channels and the multiple second air inlet channels are distributed at intervals.

[0016] Furthermore, the airflow exiting the first air inlet channel can flow in layers into the two adjacent second air inlet channels.

[0017] Furthermore, both the first blade and the second blade are provided with nine blades.

[0018] Furthermore, the airflow velocity from the first air inlet channel to the second air inlet channel is greater than the airflow velocity from the main air inlet channel directly to the second air inlet channel.

[0019] Furthermore, the flow guide also includes a flow rectifying section, which is a cone shape with a cross-section that gradually decreases from the bottom to the top.

[0020] Furthermore, the motor also includes an impeller cover, which is fixedly connected to the motor cylinder, and the main air inlet is disposed on the impeller cover.

[0021] Furthermore, the impeller cover is provided with an arc-shaped transition section near the air outlet of the moving impeller to redirect the radial airflow to the axial airflow.

[0022] Furthermore, the motor housing includes a casing that is snapped onto the underside of the impeller cover in the air inlet direction, and the stator assembly and the rotor assembly are at least partially disposed within the casing.

[0023] Furthermore, the motor also includes a fixed impeller, which is located below the moving impeller in the air inlet direction. The airflow from the second air inlet channel can flow through the fixed impeller into the housing. The fixed impeller is at least partially disposed inside the impeller cover and the other part is disposed inside the housing.

[0024] Furthermore, the motor also includes a bracket, which is at least partially snapped into the impeller cover and partially disposed in the housing, and the output shaft is rotatably connected to the bracket.

[0025] Furthermore, a bearing chamber is formed on the bracket, and a rotating bearing is fixed in the bearing chamber. The output shaft is rotatably connected to the bracket through the rotating bearing.

[0026] Furthermore, in the air intake direction, the bracket is disposed above the stator assembly, and at least three connecting parts are formed on the bracket, the at least three connecting parts being evenly distributed and snapped around the stator assembly.

[0027] Furthermore, the bracket and the fixed impeller are integrally injection molded, and the fixed impeller is arranged radially around the bracket.

[0028] Furthermore, the moving impeller has a through hole, and one end of the output shaft is disposed in the through hole and fixedly connected to the moving impeller.

[0029] Furthermore, the flow guide is formed with a fixing post, which is fixedly disposed within the through hole.

[0030] Furthermore, an air duct is formed between the housing and the stator assembly, and multiple holes are formed on the housing, through which airflow in the air duct can flow out.

[0031] Furthermore, the impeller cover is hollow inside and has openings at both ends that gradually widen from top to bottom.

[0032] Furthermore, the impeller cover includes a first part, a second part, and a third part distributed sequentially along the axial direction, and the airflow can flow through the first part, the second part, and the third part sequentially along the axial direction.

[0033] Furthermore, the radial projection ratio of the first part, the second part, and the third part is 1:4:1.

[0034] Furthermore, along the axial direction, the inner diameter of the first part remains unchanged, the inner diameter of the second part gradually increases, and the inner diameter of the third part remains unchanged, with the moving impeller disposed inside the impeller cover.

[0035] Furthermore, a brushless vacuum cleaner includes a motor with a flow guiding structure as described in any of the above claims.

[0036] Compared with existing technologies, the advantages of this utility model are:

[0037] 1. By setting the first blade on the air guide, an air inlet and an air outlet are formed between two adjacent first blades, wherein the width of the air outlet is greater than the width of the air inlet, so that the rapidly flowing airflow at the air inlet can have sufficient outlet space, and can be more stable and reduce noise.

[0038] 2. In the radial direction, by setting the thickness of the air inlet of the first blade to be less than the thickness of the air outlet, the airflow at the air inlet is faster, while the airflow at the air outlet is relatively slower. The above setting allows the lower half of the channel corresponding to the small blade to completely enclose the airflow, ensuring the efficiency of the airflow flowing into the large blade, while also preventing the leakage of airflow from causing turbulence and achieving a noise reduction effect.

[0039] 3. By setting the lower end of the first blade on the guide vane at the lower end of the impeller cover's main air inlet, the airflow in the flow channel on the small blade can fully flow into the cavity of the outer cover, avoiding the influence of the airflow outside the outer cover and ensuring the stability of the airflow inflow.

[0040] 4. By setting the impeller cover as a first part, a second part, and a third part connected sequentially along the axial direction, the inner diameter of the first part remains unchanged, the inner diameter of the second part gradually increases, and the inner diameter of the third part remains unchanged. The ratio of the projected lengths of the first part, the second part, and the third part in the axial direction is 1:4:1, which makes the airflow stable while keeping the impeller cover size small. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a motor with a flow guiding structure according to an embodiment of the present invention;

[0042] Figure 2 This is an exploded view of a motor with a flow guiding structure according to an embodiment of the present invention;

[0043] Figure 3 This is a cross-sectional view of a motor with a flow guiding structure according to an embodiment of the present invention.

[0044] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0045] Figure 5 This is a partial structural diagram of a motor with a flow guiding structure according to an embodiment of the present invention;

[0046] Figure 6 for Figure 4 Top view;

[0047] Figure 7 This is a schematic diagram of the moving impeller of a motor with a flow guiding structure according to an embodiment of the present invention;

[0048] Figure 8 This is a schematic diagram of the flow guide component of a motor with a flow guide structure according to an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the support structure of a motor with a flow guiding structure according to an embodiment of the present invention.

[0050] Figure Descriptions: 1. Motor barrel; 10. Stator assembly; 11. Rotor assembly; 12. Output shaft; 13. Housing; 130. Hole; 14. Support; 15. Air duct; 2. Impeller cover; 20. Main air inlet; 21. First part; 22. Second part; 23. Third part; 24. Upper end face; 3. Moving impeller; 30. Second blade; 31. Second air inlet channel; 4. Guide component; 40. First blade; 41. First air inlet channel; 42. Rectifier; 43. Lower end face; L1. First width; L2. Second width; L3. First distance; L4. Second distance; L5. First length; L6. Second length; L7. Third length; d1, first thickness; d2, second thickness; 230, positioning groove; 231, positioning tenon; 32, through hole; 44, fixing post; 33, first end face; 145, slot; 143, positioning post; 140, first hole; 142, third blade; 410, air inlet; 411, air outlet; 403, first end point; 300, second end point; 9, center; 401, upper end; 402, lower end; 142, bearing chamber; 148, connecting part; 16, fixed impeller; 145, first slot; 146, first positioning post; 147, second slot; 143, second positioning post; 120, rotating bearing. Detailed Implementation

[0051] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0052] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a motor with a flow guiding structure, comprising a motor housing 1, an impeller cover 2, a moving impeller 3, and flow guiding components 4. The motor housing 1 includes a stator assembly 10 and a rotor assembly 11 that cooperates with the stator assembly 10. The impeller cover 2 is fixedly connected to the motor housing 1, and a main air inlet 20 is formed at one end of the impeller cover 2 away from the motor housing 1. The moving impeller 3 is disposed within the cavity of the impeller cover 2, and is fixedly connected to the output shaft 12 of the rotor assembly 11. The flow guiding components 4 are coaxial with the moving impeller 3 and are arranged sequentially along the air inlet direction.

[0053] Important reference Figure 3 The impeller shroud 2 has a hollow interior forming a cavity, and its two ends gradually widen from top to bottom along the axial direction. Near the second air outlet of the moving impeller 3, the impeller shroud 2 has an arc-shaped transition section that redirects radial airflow to axial airflow. Specifically, the impeller shroud 2 includes a first part 21, a second part 22, and a third part 23 connected sequentially along the axial direction. The second part 22 is the arc-shaped transition section. Along the axial direction, the inner diameter of the first part 21 remains constant, the inner diameter of the second part 22 gradually increases, and the inner diameter of the third part 23 remains constant. The third part 23 is fixedly connected to the support 14, allowing airflow to pass sequentially through the first part 21, the second part 22, and the third part 23. The third part 23 has multiple positioning grooves 230, and the housing 13 has multiple positioning tenons 231 that respectively cooperate with the multiple positioning grooves 230. The multiple positioning tenons 231 are respectively accommodated in the multiple positioning grooves 230. At the same time, the third part 23 and the bracket 14 are interference-fitted so that the impeller cover 2 is fixed on the motor cylinder 1.

[0054] Optionally, the radial projection ratio of the first part 21, the second part 22, and the third part 23 is 1:4:1. The length ratio of the first part 21, the second part 22, and the third part 23 along their axial direction is also 1:4:1. If the first part 21 is too short, it may result in poor flow stabilization and insufficient airflow stability; if the first part 21 is too long, the impeller cover 2 will be too large, hindering product miniaturization. If the second part 22 is too short, it will result in poor flow stabilization and an inability to properly match the dimensions of the motor bracket 14; if the second part 22 is too long, it will result in excessively low wind speed. If the third part 23 is too short, it will not properly match the dimensions of the motor bracket 14; if the third part 23 is too long, the impeller cover 2 will be too large, hindering product miniaturization. Based on this, when the lengths of the first part 21, the second part 22, and the third part 23 in the direction along the axis, namely the first length L5, the second length L6, and the third length L7, are in the ratio of 1:4:1, it can not only better guide and stabilize the flow, making the airflow more stable and the noise lower, but also keep the wind speed within the preset range. The size of the impeller cover 2 will not be too large, and it can be well assembled with the motor bracket 14.

[0055] Optionally, along the axial direction, the inner diameter of the first part 21 remains unchanged, the inner diameter of the second part 22 gradually increases, and the inner diameter of the third part 23 remains unchanged. The moving impeller 3 is disposed inside the cavity of the impeller cover 2. The lower end face 43 of the guide member 4 abuts against the first end face 33 of the moving impeller 3. At the same time, the moving impeller 3 is matched with the first part 21, the second part 22, and the third part 23, so that when the moving impeller 3 rotates, it will not be blocked by the impeller cover 2, nor will it leave too much gap to cause airflow turbulence.

[0056] Key reference Figure 2 The motor housing 1 includes a housing 13, which is snapped onto the underside of the impeller cover 2 in the air inlet direction. The stator assembly 10 and the rotor assembly 11 are at least partially disposed inside the housing 13, thereby providing protection and support for the stator assembly 10 and the rotor assembly 11.

[0057] In addition, an air duct 15 is formed between the inner wall of the housing 13 and the outer wall of the stator assembly 10, and multiple holes 130 are formed on the housing 13. Air flows into the motor cylinder 1, enters the air duct 15, and then flows out from the multiple holes 130, which increases the heat dissipation effect.

[0058] In this embodiment, the moving impeller 3 has a through hole 32, one end of the output shaft 12 is disposed on one side of the through hole 32 and is fixedly connected to the moving impeller 3, and the guide member 4 has a fixing post 44, which is fixedly disposed on the other side of the through hole 32.

[0059] Of course, in another alternative embodiment, the guide member 4 can also be rotatably mounted in the through hole 32 via a bearing, and an additional support frame can be provided to connect the guide member 4 to the impeller cover 2, so that the guide member 4 can rotate relative to the moving impeller 3.

[0060] Further reference Figures 3 to 7 The impeller 3 has multiple second blades 30 arranged in a circumferential array around its axis, and the guide vane 4 has multiple first blades 40 arranged in a circumferential array around its axis. A first air inlet channel 41 is formed between two adjacent first blades 40, and a second air inlet channel 31 is formed between two adjacent second blades 30. The airflow exiting the outlet 411 of the first air inlet channel 41 can flow into the second air inlet channel 31, and this airflow has a relatively faster velocity than the airflow that directly enters the second air inlet channel 31 from the main air inlet 20, thus providing a certain boosting effect to the impeller 3. It can also be understood that the airflow exiting the outlet 411 of the first air inlet channel 41 can flow in layers into at least two second air inlet channels 31, thereby stratifying the airflow, reducing airflow turbulence, and thus reducing noise.

[0061] Furthermore, focus on reference Figure 5 and Figure 6 The number of first blades 40 and second blades 30 is equal, and in the axial projection direction, the first blades 40 are positioned between two adjacent second blades 30, with the first blades 40 and their adjacent second blades 30 on both sides spaced at equal angles. This results in a one-to-one distribution of multiple first air inlet channels 41 and multiple second air inlet channels 31. Ultimately, this allows the airflow from the outlet 411 of the first air inlet channel 41 to flow in stratified layers into the two adjacent second air inlet channels 31, thus stratifying the airflow. This reduces airflow turbulence caused by multiple airflows converging in one channel during high-speed operation, thereby increasing air intake efficiency and reducing vibration caused by airflow turbulence, thus reducing noise.

[0062] In this embodiment, both the first blade 40 and the second blade 30 are provided with nine blades, so that the radial width of the first air inlet channel 41 and the second air inlet channel 31 is within a reasonable range, which facilitates the entry and circulation of airflow.

[0063] Further reference Figure 5 The ratio of the first width L1 at the air inlet 410 of the first air inlet channel 41 to the second width L2 at the air outlet 411 is 0.77-0.91. Multiple experiments have shown that this configuration allows the rapidly flowing air at the air inlet 410 to have sufficient outlet space, resulting in a more stable airflow and reduced noise.

[0064] Further reference Figure 8The ratio of the first thickness d1 of the upper end 401 of the first blade 40 to the second thickness d2 of the lower end 402 is 0.80-0.90. Multiple experiments have shown that this configuration allows for a faster airflow at the inlet 410 and a slower airflow at the outlet 411. This ensures that the lower half of the channel corresponding to the first blade 40 completely encloses the airflow, guaranteeing efficient airflow into the second blade 30. It also prevents turbulent airflow from leaking out and contributes to noise reduction.

[0065] Important reference Figure 6 The ratio of the first distance L3 from the first end point 403 of the first blade 40 to its center 9 to the second distance L4 from the second end point 300 of the upper end of the second blade 30 to its center 9 is between 0.65 and 0.8, more specifically, between 0.7 and 0.75. Furthermore, in the airflow direction, the first blade 40 is located outside the second blade 30, meaning the first blade 40 contacts the airflow first and absorbs it. Consequently, the airflow velocity flowing from the outlet end of the first blade 40 into the second blade 30 is greater than the airflow velocity flowing directly into the uncovered portion of the second blade 30. Thus, the airflow flowing from the first blade 40 into the flow channel of the second blade 30 can boost the airflow in the uncovered portion of the flow channel of the second blade 30. Specifically, the airflow velocity flowing from the first air inlet channel 41 to the second air inlet channel 31 is greater than the airflow velocity flowing directly into the second air inlet channel 31 through the main air inlet 20, thereby boosting the airflow in the uncovered portion of the flow channel of the second blade 30.

[0066] At the same time, we should focus on referencing Figure 3 and Figure 4 The upper end 401 of the first blade 40 is located outside the main air inlet 20 of the motor cylinder 1 in the air inlet direction, and the lower end 402 of the first blade 40 is located inside the main air inlet 20 of the motor cylinder 1 in the air inlet direction. This allows the airflow in the first air inlet channel 41 to flow fully into the cavity of the impeller cover 2, avoiding the influence of the airflow outside the impeller cover 2 and ensuring the stability of the airflow inflow.

[0067] In addition, the guide member 4 also includes a rectifier 42, which is a cone with a cross-section that gradually decreases from the bottom to the top. The guide member 4 passes through the main air inlet 20 and is at least partially located outside the impeller cover 2 in order to stabilize the airflow.

[0068] Further reference Figure 2 The motor also includes a fixed impeller 16. In the air inlet direction, the fixed impeller 16 is located below the moving impeller 3. The airflow from the second air inlet channel 31 can flow through the fixed impeller 16 and enter the housing 13. The fixed impeller 16 is at least partially disposed inside the impeller cover 2 and the other part is disposed inside the housing 13, so that the airflow flowing from the moving impeller 3 to the fixed impeller 16 can smoothly enter the housing 13.

[0069] In addition, the motor also includes a bracket 14, which is at least partially snapped into the impeller cover 2 and the other part disposed in the housing 13. The output shaft 12 is rotatably connected to the bracket 14. Specifically, the bracket 14 is generally disc-shaped, the moving impeller 3 is disposed above the bracket 14, and the side of the bracket 14 near the moving impeller 3 fits the shape of the moving impeller 3. The output shaft 12 rotatably passes through the bracket 14 and snaps into the moving impeller 3 to drive the moving impeller 3 to rotate around its axis, allowing air fluid to enter the motor.

[0070] Optionally, the bracket 14 and the fixed impeller 16 are integrally injection molded, and the fixed impeller 16 is arranged around the bracket 14 in the radial direction, making the internal structure of the motor more compact and reducing its volume.

[0071] Further reference Figure 3 A bearing chamber 142 is formed on the bracket 14, and a rotating bearing 120 is fixed inside the bearing chamber 142. The output shaft 12 is rotatably connected to the bracket 14 through the rotating bearing 120.

[0072] Key reference Figure 9 Optionally, in the air inlet direction, the bracket 14 is positioned above the stator assembly 10, and at least three connecting portions 148 are formed on the bracket 14. The at least three connecting portions 148 are evenly distributed and engaged around the stator assembly 10. Specifically, a first slot 145 and a first positioning post 146 are formed on the connecting portion 148, and a second slot 147 and a second positioning post 143 are formed at corresponding positions on the stator assembly 10. The first positioning post 146 and the second positioning post 143 are respectively engaged in the corresponding second slot 147 and first slot 145 to fix the bracket 14 to the stator assembly 10.

[0073] In this embodiment, a first hole 140 is also formed on the bracket 14. The first hole 140 is coaxially arranged with the bearing chamber 142. The output shaft 12 slidably passes through the first hole 140 and engages with the moving impeller 3. The airflow first flows in through the moving impeller 3, and then flows into the motor barrel 1 through the fixed impeller 16. Specifically, the fixed impeller 16 includes a plurality of third blades 142, which are used to reduce the impact force when the airflow enters the motor barrel 1, thereby reducing the vibration of the motor and thus reducing noise.

[0074] During operation, the stator assembly 10 drives the rotor assembly 11, thereby causing the output shaft 12 to rotate. The output shaft 12 drives the impeller 3 and the guide 4 to rotate. Air enters from the main air inlet 20. Part of the airflow flows directly into the second air inlet channel 31, while the other part flows through the first air inlet channel 41 formed between two adjacent first blades 40 to the two adjacent second air inlet channels 31, which boosts the impeller 3. Then, the airflow flows from the second air inlet channel 31 to the stator impeller 16, enters the motor cylinder 1, and then enters the air duct 15. Finally, it flows out from the multiple holes 130 on the housing 13.

[0075] This invention uses a guide wheel 4 as a flow guiding structure, and the guide wheel 4 is located on the outside of the moving impeller 3 in the air intake direction. This allows the airflow to be stratified when it flows through the guide wheel 4 to the moving impeller 3, thereby reducing the airflow turbulence caused by multiple airflows converging in one channel during high-speed operation. This increases the air intake efficiency and reduces the vibration caused by airflow turbulence, thus reducing noise.

[0076] Finally, this embodiment also provides a brushless vacuum cleaner, which includes the motor with the aforementioned flow guiding structure.

[0077] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electric machine with a flow guiding structure, said electric machine comprising an electric machine cylinder (1) and an impeller wheel (3), said electric machine cylinder (1) comprising a stator assembly (10) and a rotor assembly (11) cooperating with said stator assembly (10), said impeller wheel (3) being connected to an output shaft (12) of said rotor assembly (11), characterized in that, The motor further comprises: a flow guide (4) coaxial with the moving impeller (3) and arranged in sequence along the air inlet direction, a plurality of first blades (40) being formed on the flow guide (4) and arranged in a circumferential array around the axis of the flow guide (4); a plurality of second blades (30) being formed on the moving impeller (3) and arranged in a circumferential array around the axis of the moving impeller (3); a first air inlet channel (41) is formed between two adjacent first blades (40), a second air inlet channel (31) is formed between two adjacent second blades (30), and the airflow flowing out of the air outlet (411) of the first air inlet channel (41) can flow into the second air inlet channel (31).

2. The electric machine with flow guiding structure according to claim 1, characterized in that, The airflow flowing out of the air outlet (411) of the first air inlet channel (41) can flow into at least two second air inlet channels (31) in a layered manner.

3. The electric machine with flow guiding structure according to claim 1, characterized in that, The ratio of the first width (L1) at the air inlet (410) of the first air inlet channel (41) to the second width (L2) at the air outlet (411) is 0.77-0.

91.

4. The electric machine with flow guiding structure according to claim 1, characterized in that, The ratio of the first thickness (d1) of the upper end (401) of the first blade (40) to the second thickness (d2) of the lower end (402) is 0.80-0.

90.

5. The electric machine with flow guiding structure according to claim 1, characterized in that, The ratio of the first distance (L3) from the first end point (403) of the first blade (40) to the center (9) to the second distance (L4) from the second end point (300) of the upper end of the second blade (30) to the center (9) is between 0.65 and 0.

8.

6. The electric machine with flow guiding structure according to claim 1, characterized in that, The upper end (401) of the first blade (40) is located outside the total air inlet (20) of the motor cylinder (1) in the air inlet direction, and the lower end (402) of the first blade (40) is located inside the total air inlet (20) of the motor cylinder (1) in the air inlet direction.

7. The electric machine with flow guiding structure according to claim 1, characterized in that, The number of the first blades (40) is equal to the number of the second blades (30), and in the axial projection direction, a plurality of first air inlet channels (41) and a plurality of second air inlet channels (31) are distributed one by one.

8. The electric machine with flow guiding structure according to claim 7, characterized in that, The airflow flowing out of the air outlet (411) of the first air inlet channel (41) can flow into two adjacent second air inlet channels (31) arranged correspondingly.

9. The electric machine with flow guiding structure according to claim 7, characterized in that, Both the first blades (40) and the second blades (30) are provided with nine.

10. The electric machine with flow guiding structure according to claim 6, characterized in that, The flow rate of the airflow flowing through the first air inlet channel (41) to the second air inlet channel (31) is greater than the flow rate of the airflow flowing directly through the total air inlet (20) to the second air inlet channel (31).

11. The electric machine with flow guiding structure according to claim 1, characterized in that, The flow guide (4) further comprises a flow straightening portion (42) which is tapered with a cross section gradually decreasing from the bottom end upwards.

12. The electric machine with flow guiding structure according to claim 6, characterized in that, The motor further comprises an impeller cover (2) fixedly connected with the motor cylinder (1), and the total air inlet (20) is arranged on the impeller cover (2).

13. The electric machine with flow guiding structure according to claim 12, characterized in that, The impeller cover (2) is provided with an arc-shaped transition portion near the second air outlet of the moving impeller (3) for diverting the radial airflow to the axial airflow.

14. The electric machine with flow guiding structure according to claim 12, characterized in that, The motor cylinder (1) comprises a shell (13) which is clamped below the impeller cover (2) in the air inlet direction, and the stator assembly (10) and the rotor assembly (11) are at least partially arranged in the shell (13).

15. The electric machine with flow guiding structure according to claim 14, characterized in that, The motor further comprises a stator impeller (16) which is arranged below the dynamic impeller (3) in the air inlet direction, and the airflow discharged from the second air inlet channel (31) can flow into the shell (13) through the stator impeller (16), and the stator impeller (16) is at least partially arranged in the impeller cover (2) and partially arranged in the shell (13).

16. The electric machine with flow guiding structure according to claim 15, characterized in that, The motor further comprises a bracket (14) which is at least partially clamped in the impeller cover (2) and partially arranged in the shell (13), and the output shaft (12) is rotationally connected with the bracket (14).

17. The electric machine with flow guiding structure according to claim 16, characterized in that, The bracket (14) is formed with a bearing chamber (142) in which a rotating bearing (120) is fixed, and the output shaft (12) is rotationally connected with the bracket (14) through the rotating bearing (120).

18. The electric machine with flow guiding structure of claim 16, wherein, In the air inlet direction, the bracket (14) is arranged above the stator assembly (10), and the bracket (14) is formed with at least three connecting portions (148) which are uniformly distributed and clamped around the stator assembly (10).

19. The electric machine with flow guiding structure of claim 16, wherein, The bracket (14) is integrally formed with the stator impeller (16), and the stator impeller (16) is arranged around the bracket (14) in the radial direction.

20. The electric machine with flow guiding structure according to claim 1, characterized in that, The dynamic impeller (3) is formed with a through hole (32), one end of the output shaft (12) is arranged in the through hole (32) and fixedly connected with the dynamic impeller (3).

21. The electric machine with flow guiding structure according to claim 20, characterized in that, The flow guide (4) is formed with a fixing column (44) which is fixedly arranged in the through hole (32).

22. The electric machine with flow guiding structure of claim 14, wherein, An air duct (15) is formed between the shell (13) and the stator assembly (10), a plurality of holes (130) are formed on the shell (13), and the airflow in the air duct (15) can flow out through the holes (130).

23. The electric machine with flow guiding structure of claim 12, wherein, The inside of the impeller cover (2) is hollow and the two ends are open and gradually widened from top to bottom.

24. The electric machine with flow guiding structure of claim 12, wherein, The impeller cover (2) comprises a first part (21), a second part (22) and a third part (23) which are sequentially arranged along the axial direction, and the airflow can sequentially flow through the first part (21), the second part (22) and the third part (23) along the axial direction.

25. The electric machine with flow guiding structure according to claim 24, characterized in that, The proportions of the first part (21), the second part (22) and the third part (23) projected in the radial direction are 1:4:

1.

26. The electric machine with flow guiding structure of claim 24, wherein, Along the axial direction, the inner diameter of the first part (21) is constant, the inner diameter of the second part (22) gradually increases, and the inner diameter of the third part (23) is constant, and the dynamic impeller (3) is arranged in the impeller cover (2).

27. A brushless dust cup, characterized by The motor with the flow guide structure of any one of claims 1-26 is included.

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